Complex sentence: Maine Medical Center is a teaching hospital, with a former affiliation with the University of Vermont College of Medicine since the late 1970s that ended in 2011 with the introduction of a Maine-track program at Tufts University School of Medicine.
Split into simpler sentences: Maine Medical Center is a teaching hospital, with an affiliation with the University of Vermont College of Medicine since the late 1970s. This affiliation will be ending in 2011 with the introduction of a Maine-track program at Tufts University School of Medicine.