Question

Reading the letter she was upset turn into complex​

Answer 1

A complex sentence is a sentence with 1 independent clause, and 1 or more dependent clauses. An independent clause would make sense on its own.

She was upset - independent clause

Dependent clauses would not make sense without the independent clause.

As she read the letter - dependent clause.

As she read the letter, she became upset.

or

She became upset as she read the letter.

or

Reading the letter, she was upset.

Hope this helps! Livvi :)

Answer 2

Answer:

As she read the letter, she was upset