Simplify the following text for a Grade 10 native English-speaking person.
Original: The name Leedsichthys means `` Leeds ' fish '' , after the fossil collector Alfred Nicholson Leeds , who discovered it before 1886 near Peterborough , England .
Simplified: The fossil is named after its discoverer , Alfred Nicholson Leeds , who discovered it before 1886 near Peterborough , England .