Complex sentence: The duties of this chair requiring only short visits to Ireland in certain terms of each year, he continued to reside and pursue his studies in London, and became a frequent writer on economic and social questions in the principal reviews and other periodicals.
Split into simpler sentences: The duties of this chair requiring only short visits to Ireland in certain terms of each year. He continued to reside and pursue his studies in London, and became a frequent writer on economic and social questions in the principal reviews and other periodicals.