Complex sentence: In November 2002, Seattle voters approved the construction of a new 14-mile (23 km) monorail line, the "Green Line", which was to be the first of five monorail lines running throughout the city.
Split into simpler sentences: In November 2002, Seattle voters approved the construction of a new 14-mile monorail line. The "Green Line," as it was known, was to be the first of five monorail lines running throughout the city.