Question

what is sentence variety and rhythm

Answer 1

Here are several excellent webpages that explain and give good examples, both of what to do and what not to do!

http://grammar.ccc.commnet.edu/grammar/sentences.htm

http://grammar.ccc.commnet.edu/grammar/primer.htm

http://owl.english.purdue.edu/owl/resource/573/01/

http://www.llumina.com/writing_with_rhythm.htm