Complex sentence: He was president of the Royal College of Physicians of Ireland first in 1681 and on a number of occasions until 1706 and on his death in 1713 he left his personal library to the college.
Split into simpler sentences: He was president of the Royal College of Physicians of Ireland first in 1681 and on a number of occasions until 1706. On his death in 1713, Dun left his personal library to the college.