Complex sentence: When this most recently occurred in, the Sunday afternoon games were played as regularly scheduled on Christmas Eve, while the Sunday Night Football game was moved to Christmas Day, at 4:30 p.m. EST on NBC.
Split into simpler sentences: When this most recently occurred in, the Sunday afternoon games were played as regularly scheduled on Christmas Eve. The Sunday Night Football game was moved to Christmas Day, at 4:30 p.m. EST on NBC.