Complex sentence: Gordon the Big Engine is a fictional anthropomorphic tender locomotive in "The Railway Series" books by Rev. W. Awdry and is one of the central characters in the television series "Thomas and Friends", which is based on the books.
Split into simpler sentences: Gordon the Big Engine is a fictional anthropomorphic tender locomotive in "The Railway Series" books by Rev. W. Awdry. Gordon is one of the central characters in the TV series "Thomas the Tank Engine & Friends", which is based on the books.