Complex sentence: Wabash River was down repeatedly for long stretches due to gasifier problems, and the gasifier problems have not been remedied--subsequent projects, such as Excelsior's Mesaba Project, have a third gasifier and train built in.
Split into simpler sentences: Wabash River was down repeatedly for long stretches due to gasifier problems. The gasifier problems have not been remedied--subsequent projects, such as Excelsior's Mesaba Project, have a third gasifier and train built in.