Complex sentence: The Northern trail could also be seen from the zoo's monorail which was run year round, but permanently closed on Sept 2,2013 as the trains were outdated and hard to find new parts for.
Split into simpler sentences: The Northern trail can also be seen from the zoo's monorail which is run year round. The monorail closed on Sept 2,2013 permanently as the trains were outdated and hard to find new parts for.