Complex sentence: Around 1915, feeling better, and unable to stay quiescent, Boyce took on the position of President of the Chicago Glass Novelty Company, headquartered in Marion, IN, a position he held until his death in 1935.
Split into simpler sentences: Around 1915, feeling better, and unable to stay quiescent, Boyce took on the position of President of the Chicago Glass Novelty Company, headquartered in Marion, IN. This is a position he held until his death in 1935.