Many of you need to develop your writing so that your sentence structures are more clear, varied, and sophisticated.
See the following links, which include tips and activities/exercises, for help with these issues:
The Elements of Style - by Strunk and White - this is THE style guide for most universities and journalists, worldwide
Online Writing Lab (OWL) at Purdue University - amazing tips for all areas of writing and citation - this particular page deals with sentence structure, including exercises
Syntax Information - read and learn!
Syntax Worksheets - based on skills/needs
Great Sentence Worksheets:
http://www.wcmason.com/wcmcol/Grammar/Holt%20Handbook%2006%20Exercises.pdf
http://www.wcmason.com/wcmcol/Grammar/Holt%20Handbook%2007%20Exercises%20UA.pdf
http://www.wcmason.com/wcmcol/Grammar/Sentence%20Combine%2000%20HT.pdf
The entire Holt Language Handbook - for a whole lot of practice and information on parts of speech, punctuation, grammar, clauases, and sentence structure