Question

The mirror was obviously made in India. The oxide at its back had come off at several places.(join into complex sentence).

Answer 1

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Actually Welcome to the Concept of the Types of Sentences.

There are many types of sentences that are,

1.) Simple Sentence

2.) Compound Sentence

3.) Complex Sentence

So here, we dealing with a complex sentence.

Basically a complex sentence is such sentence that has a one main clause that is independent and there may 1 or 2 dependent clause.

These clauses are joined by the city conjunction words like And, but,etc.

so here we use.

===>

⭐The mirror was obviously made in India, but the oxide at its back had come off at several places.