Complex sentence: SEPTA's Trolley Route 56, the Erie & Torresdale Avenues Line is a streetcar line and is currently operated by bus, it is operated by the Southeastern Pennsylvania Transportation Authority (SEPTA) in Philadelphia, Pennsylvania, United States.
Split into simpler sentences: SEPTA's Trolley Route 56, the Erie and Torresdale Avenues Line is a former streetcar line and is currently operated by bus. It is operated by the Southeastern Pennsylvania Transportation Authority (SEPTA) in Philadelphia, Pennsylvania, United States.