Complex sentence: By 14 August 1484 Mountjoy was gravely ill, and Sir Thomas Montgomery, who later married Mountjoy's widow, was authorized to act as his deputy, while Mountjoy's brother, James Blount, took over as captain at Hammes.
Split into simpler sentences: By 14 August 1484 Mountjoy was gravely ill. Sir Thomas Montgomery, who later married Mountjoy's widow, was authorized to act as his deputy. His brother, James Blount, took over as captain at Hammes.