Complex sentence: Valenzuela railway station is a proposed railway station that is situated on the "Northrail line", which has been used for passenger and freight transportation by Philippine National Railways and its precursors in the past.
Split into simpler sentences: Valenzuela railway station is a proposed railway station that is situated on the "Northrail line". This line has been used for passenger and freight transportation by Philippine National Railways and its precursors in the past.