If i am given three paragraphs how do i write a thesis not to wordy

No matter how long or short an essay you are supposed to write, follow the writing process, whether you're writing for science, history, English, or whatever:

Prewriting: Brainstorm, research, plan, outline, thesis statement

Writing: Write first draft by starting with section II of your outline; write the introduction after the body of the paper is written; write the conclusion last.

Polishing: Revise, concentrating first on the body of the paper, then the intro, then the concl (revision = making sure ideas are logical and sequential and support your thesis); proofread (spelling, grammar, usage, etc.)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Your thesis statement must include factual information (which you already have) plus your position/opinion/stance. Without your position on the topic, it isn't a true thesis statement. So think of this sentence as the angle you want to take on the topic and what you intend to prove by the end of your paper. (If your statement is simply factual, then there's nothing to prove!)

http://leo.stcloudstate.edu/acadwrite/thesistatement.html
This is one of the very best places I've seen online to help students write good thesis statements. It shows you sentences that aren't thesis statements and how to turn each one into real thesis statements.