Complex sentence: Soon after Henry's coronation Gerard was appointed to the recently vacant see of York, and became embroiled in the long-running dispute between York and the see of Canterbury concerning which archbishopric had primacy over England.
Split into simpler sentences: Soon after Henry's coronation Gerard was appointed to the recently vacant see of York. As archbishop he became embroiled in the long-running dispute between York and the see of Canterbury concerning which archbishopric had primacy over England.