Complex sentence: Position lights were developed by A.H. Rudd, Superintendent of Signalling of the Pennsylvania Railroad (PRR) and were introduced in 1915 as a replacement for semaphore signals on the Main Line between Paoli and Philadelphia due to visibility problems caused by the new overhead electrification project.
Split into simpler sentences: Position lights were developed by A.H. Rudd, Superintendent of Signalling of the Pennsylvania Railroad (PRR). They were introduced in 1915 as a replacement for semaphore signals on the Main Line between Paoli and Philadelphia due to visibility problems caused by the new overhead electrification project.