Question

I have found a lost book make into a complex sentence

Answer 1

Answer:

The given simple sentence can be changed into a complex sentence as shown below:

I have found the book that I had lost.

or

I have found the book which had been lost.

Explanation:

Simple Sentence

A simple sentence is made up of only one clause. It has just one subject and one predicate.  

Example

Flowers are beautiful.

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.

Example

I hope that I will pass the test.