Complex sentence: Zimmerman worked with local clergy in Wisconsin, and in a few weeks had collected almost 200 clergy signatures on the letter which was delivered to the Grantsburg School Board on December 16,2004.
Split into simpler sentences: Zimmerman worked with local clergy in Wisconsin to get clergy to sign this letter, and in a few weeks he had collected almost 200 clergy signatures. The signed letter was delivered to the Grantsburg School Board on December 16,2004.