Question

having done the work and he went home spot the error​

Answer 1

Answer:

 he went home. He went home because he had done his work.

Answer 2

When he had finished his work, he went home

Explanation:

A complex sentence is a sentence which has an independent clause and one or more subordinate/dependent clauses. An independent clause can stand on its own as a sentence, however, a subordinate/dependent clause although it has a subject and a verb cannot stand on its own.

A simple sentence can be converted into a complex sentence by expanding a word or phrase into a complex sentence, which can be  a noun clause, an adjective clause or an adverb clause.