Read the sentences.
[1] i am interested in history. [2] i decided to read the declaration of independence.
which of the following options shows the best revisions of sentences 1 and 2 to create sentence variety without combining the
sentences?
i decided to read the declaration of independence. i am quite interested in history.
i am interested in the declaration of independence. i decided to study history.
history interests me. i decided to read the declaration of independence.
history interests me. the declaration of independence is something i decided to read.

One which shows the best revisions of sentences 1 and 2 to create sentence variety without combining the  sentences is the last option - History interests me. The Declaration of Independence is something I decided to read.

Explanation:

Though all the sentences are grammatically correct, the last option explains the meaning of the two separate sentences in a clear manner. Someone is interested in history so he/she has decided or chosen "The Declaration of Independence" topic to go through it. This meaning isn't very clear in the other three options. The first option is where the sentences are juxtaposed. The second option focuses on one's interest in the topic and not on the subject history. The third option conveys the meaning somehow but doesn't sound good.

umm of course in fact ur getting your answer : )