Complex sentence: The current configuration dates from a 1956--61 reconstruction project to straighten the platforms and eliminate a level junction north of the station, which had caused a switching bottleneck; a station at Myrtle Avenue was closed as part of the renovation.
Split into simpler sentences: The current configuration dates from a 1956--61 reconstruction project to straighten the platforms and eliminate a level junction north of the station that had caused a switching bottleneck. A station at Myrtle Avenue was closed as part of the renovation.