Complex sentence: What is now the unincorporated village of Chesterfield was known as Recklesstown in the 18th and early 19th centuries, named for one of its founders, Joseph Reckless.
Split into simpler sentences: What is now the unincorporated village of Chesterfield was known as Recklesstown in the 18th and early 19th centuries. Its name derived from one of its founders, Joseph Reckless.