Complex sentence: Sir Christopher Barnewall (1522--1575) was a leading Anglo-Irish statesman of the Pale in the 1560s and 1570s, and was the effective Leader of the Opposition in the Irish House of Commons in the Parliament of 1568--71.
Split into simpler sentences: Sir Christopher Barnewall (1522--1575) was a leading Anglo-Irish statesman of the Pale in the 1560s and 1570s. He was the effective Leader of the Opposition in the Irish House of Commons in the Parliament of 1568--71.