Simplify the following text for a Grade 5 native English-speaking person.
Original: Caenorhabditis elegans is a free-living , transparent nematode ( roundworm ) , about 1 mm in length , which lives in temperate soil environments .
Simplified: Caenorhabditis elegans ( C. elegans ( see el-eh-ganz ) for short ) is the name of an animal called a roundworm or nematode . C. elegans is about 1 mm long .