Simplify the following text for a Grade 4 native English-speaking person.
Original: Carlinville is named for Thomas Carlin , once Governor of Illinois , who as a member of the state legislature was instrumental in creating Macoupin County . Carlinville has long been a site of Illinois history , and has played host to many presidential hopefuls via campaign stops at a time in American history when railway routes produced many visits by politicians .
Simplified: Carlinville is a city of Illinois in the United States .