Question

when they build one, I will go. (change into simple)

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Answer 1

Answer:

when they builded one I will go

Answer 2

I will go when it's built.

Simple sentence:

Simple sentences are sentences that are made up of a single clause. They are the simplest form of sentences that only have a verb, a subject, and a complete thought.

Unlike complex or compound sentences, it is not dependent on another clause or other part of the sentence. Hence, this sentence can be converted into a simple sentence:

I will go when it's built.