Simplify the following text for a Grade 13 native English-speaking person.
Original: Citizendium ( `` the citizens ' compendium of everything '' ; ) is an English-language wiki-based free encyclopedia project launched by Larry Sanger , who co-founded Wikipedia in 2001 .
Simplified: Citizendium ( short for the citizens ' compendium ) is an English-language wiki-based online encyclopedia launched by Larry Sanger in 2007 .