Complex sentence: For a great many years the tithes went to the Chichesters of Arlington, Devon, England who are not known to have contributed to the church building, which for centuries was accepted as the responsibility of the Vaughan family of Trawsgoed.
Split into simpler sentences: For a great many years the tithes went to the Chichesters of Arlington, Devon, England. They are not known to have contributed to the church building, which for centuries was accepted as the responsibility of the Vaughan family of Trawsgoed.