Answer:
Split infinitive: He was to diligently read each night.
Correction: He was to read diligently each night.
Step-by-step explanation:
A split infinitive occurs when a sentence is constructed using an infinitive and an adverb, while adding the word "to" before the adverb.
This can be corrected by arranging the words correctly without changing the intended meaning. This is done by placing the verb before the adverb in the sentence.