Complex sentence: When his half-brother deposed Richard and took the throne as Henry IV of England, he was made Bishop Beaufort Chancellor of England in 1403, but he resigned that position the next year to become Bishop of Winchester.
Split into simpler sentences: When his half-brother deposed Richard and took the throne as Henry IV of England, he made Bishop Beaufort Chancellor of England in 1403. Beaufort resigned that position the next year to become Bishop of Winchester.