Question

The house built lost gear collapsed in the rain.(change into a complex sentence with a relative clause.)

Answer 1

Explanation:

The house which collapsed in the rain was built last year .

Answer 2

The house that had been built last year collapsed in the rain

Explanation:

• A simple sentence can be converted into a complex sentence by expanding a word/phrase into a dependent/subordinate clause - that can be a noun/adjective/adverb clause
• A noun clause serves the purpose of a noun. That implies it is the object or subject of a verb. It can be the object of a preposition, as well. A noun clause is a type of dependent/subordinate clause. It is typically introduced by the conjunction that. It is also introduced by other conjunctions such as if, who, whether, when, where, what, and so on.
• Had been implies something that started  in the past, lasted for some time, and then ended.

To know more

l know her name (simple to complex sentence ) - Brainly.in

https://brainly.in/question/1577684