Complex sentence: James Nowlan (1855--30 or 20 June 1924) was the President of the Gaelic Athletic Association from 1901 to 1921 and is the longest serving president of the organisation.
Split into simpler sentences: James Nowlan (1855--20 June 1924) was the President of the Gaelic Athletic Association from 1901 to 1921. He was the longest serving president of the organisation.