Edwin A Abbott, How to Write Clearly (1883)

36.   Repeat a Preposition after an intervening Conjunction, especially if a Verb and an Object also intervene.

"He forgets the gratitude that he owes to those that helped all his companions when he was poor and uninfluential, and (to) John Smith in particular." Here, omit to, and the meaning may be "that helped all his companions, and John Smith in particular." The intervention of the verb and object, "helped" and "companions," causes this ambiguity.

37.  When there are several Verbs at some distance from a Conjunction on which they depend, repeat the Conjunction.¹

"When we look back upon the havoc that two hundred years have made in the ranks of our national authors—and, above all, (when) we refer their rapid disappearance to the quick succession of new competitors—we cannot help being dismayed at the prospect that lies before the writers of the present day."

Here omit ''when," and we at once substitute a parenthetical statement for what is really a subordinate clause.

In reporting a speech or opinion, "that" must be continually repeated, to avoid the danger of confusing what the writer says with what others say.

"We might say that the Caesars did not persecute the Christians; (that) they only punished men who were charged, rightly or wrongly, with burning Rome, and committing the foulest abominations in secret assemblies; and (that) the refusal to throw frankincense on the altar of Jupiter was not the crime, but only evidence of the crime." But see (6 b).

37 a. Repeat Verbs after the conjunctions "than," "as," &c.

"I think he likes me better than you;" i.e. either "than you like me,"or "he likes you."

"Cardinal Richelieu hated Buckingham as sincerely as did the Spaniard Olivares." Omit "did," and you cause ambiguity.

38.  If the sentence is so long that it is difficult to keep the thread of meaning unbroken, repeat the subject, or some other emphatic word, or a summary of what has been said.

"Gold and cotton, banks and railways, crowded ports, and populous cities—these are not the elements that constitute a great nation." ...

¹ The repetition of Auxiliary Verbs and Pronominal Adjectives is also conducive to clearness.

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