Meaning: This means that he has a job that he works hard at every day, and he finishes his work before the end of the day.
Choice of Words:He is a pronoun that refers to a male person. Toils is a verb that means to work hard. Diligently is an adverb that means with care and effort. Each day is a noun phrase that refers to every day. Until is a preposition that means up to the time of. Nightfall is a noun that refers to the time of day when the sun goes down. When you put them together, "He toils diligently each day until nightfall" means that he works hard every day until the end of the day.
He labors assiduously every day prior to sunset
Meaning: This means that he has a job that he works hard at every day, and he finishes his work before the end of the day.
Choice of Words:He is a pronoun that refers to a male person. Labors is a verb that means to work hard. Assiduously is an adverb that means with great care and attention. Every day is a noun phrase that refers to each day. Prior to is a preposition that means before. Sunset is a noun that refers to the time of day when the sun goes down. When you put them together, "He labors assiduously every day prior to sunset" means that he works hard every day until the end of the day.