This complex sentence, though very long, is perfectly easy to follow. It begins with a long compound noun clause (consisting of nine coördinate that-clauses). This would be the subject of the main predicate verb were, but for the fact that the pronoun these is inserted to act as the subject (referring back to the compound noun clause and summing it up in a single word). To the complement things is attached the adjective clause which excited ... contempt. This clause is complex, for it contains three adjective clauses, (1) from which they had sprung (modifying class), (2) into which ... themselves (modifying that), and (3) which is ... contempt (modifying aversion). All three are separately attached to the clause on which they depend, which excited that bitter aversion. Thus all that portion of the sentence which follows things forms one complex clause, modifying that noun.
6. That I may avoid the imputation of throwing out, even privately, any loose, random imputations against the public conduct of a gentleman for whom I once entertained a very warm affection, and whose abilities I regard with the greatest admiration, I will put down, distinctly and articulately, some of the matters of objection which I feel to his late doctrines and proceedings, trusting that I shall be able to demonstrate to the friends whose good opinion I would still cultivate, that not levity, nor caprice, nor less defensible motives, but that very grave reasons, influence my judgment.—Burke.
This is a fine example of a long, but well-constructed complex sentence. The main clause is I will put down, distinctly and articulately, some of the matters of objection. Upon this simple clause, everything else in the sentence depends in one way or another.
II. IN COMPOUND COMPLEX SENTENCES
526. Any complex sentence, however elaborate, may be used as one of the coördinate complex clauses that make up a compound complex sentence.
1. While the king was treated at this rude rate, Cromwell, with his army, was in Scotland, obstructing the motions that were making in his favor; but on the approach of the Scots, who were much superior in number, he was forced to retire towards Dunbar, where his ships and provisions lay.—Burnet.
In this compound complex sentence, both coördinate clauses are complex. In each, the main clause has two subordinate clauses attached to it separately ([§ 520]).
2. They had seen me cut the cables, and thought my design was only to let the ships run adrift, or fall foul on each other; but when they perceived the whole fleet moving in order, and saw me pulling at the end, they set up such a scream of grief and despair as it is almost impossible to describe or conceive.—Swift.
In this compound complex sentence, both of the two coördinate clauses are complex. The first contains the noun clause [that] my design ... each other, used as the object of thought. The second contains two subordinate clauses, separately attached to the main clause (they set ... despair). For the infinitive cut, see [§ 322]. The infinitive to let is used as a predicate nominative ([§ 491]); it has as its object the infinitive clause the ships ... each other, containing two infinitives, run and fall ([§ 325]).
3. While things went on quietly, while there was no opposition, while everything was given by the favor of a small ruling junto, Fox had a decided advantage over Pitt; but when dangerous times came, when Europe was convulsed with war, when Parliament was broken up into factions, when the public mind was violently excited, the favorite of the people rose to supreme power.—Macaulay.