Complex sentence: He returned to England in 1805, was admitted an extra-licentiate (without examination) of the London Royal College of Physicians; and Dr. Woodville dying in 1806, he succeeded him as physician at the Smallpox Hospital.
Split into simpler sentences: He returned to England in 1805, and was admitted as an extra-licentiate (without examination) to the London Royal College of Physicians. When Dr. Woodville died in 1806, he succeeded him as physician at the Smallpox Hospital.