Complex sentence: Morgan taught all morphology-related courses, while the other member of the department, Jacques Loeb, taught the physiological courses; though Loeb only stayed for one year, it was the beginning of a lifelong friendship.
Split into simpler sentences: Morgan taught all morphology-related courses, while the other member of the department, Jacques Loeb, taught the physiological courses. Although Loeb stayed for only one year, it was the beginning of their lifelong friendship.