Complex sentence: The origin of the event is unclear, however it is unlikely to be before 1800, however by the early 20th century the tradition had died out due to the railways, as the local population travelled further for their annual break during the Saddleworth Wakes week.
Split into simpler sentences: The origin of the event is unclear, however it is unlikely to be before 1800. By the early 20th century the tradition had died out due to the railways, as the local population travelled further for their annual break during the Saddleworth Wakes week.