Complex sentence: The oil spill came from a pipeline owned by Plains All American Pipeline that typically moves crude oil from Exxon Mobil's three offshore platforms from the onshore receiving plant along the coast to another pipeline that will transport the oil further inland.
Split into simpler sentences: The oil spill came from a pipeline owned by Plains All American Pipeline. The ruptured pipeline typically moves crude oil from Exxon Mobil's three offshore platforms from the onshore receiving plant along the coast to another pipeline that will transport the oil further inland.