Question

Cinema is a form of commercial art(change into complex )

Answer 1

A form of commercial art is a cinema


I hope it helps

Answer 2

It is believed that cinema is a form of commercial art.

or

Cinema is a form of art which is considered as commercial art.

or

Although cinema is a form of art, yet it is considered as commercial art.

Explanation

A complex sentence has one independent and one or more dependent clauses. The clauses in a complex sentence can be in any order. If the dependent clause is first, a comma is usually after it.