Complex sentence: Sir John Fenn (1739--1794) was an English antiquary who is best remembered for collecting, editing, and publishing the Paston Letters which uniquely described the life and political scheming of the gentry in Medieval England.
Split into simpler sentences: Sir John Fenn (1739--1794) was an English antiquary. He is best remembered for collecting, editing, and publishing the Paston Letters, describing the life and political scheming of the gentry in Medieval England.