Complex sentence: In 1855 he became Minister of the Interior and Prime Minister, and attempted, by combining the moderate elements of the Catholic and Liberal parties, the impossible task of resolving the educational and other questions by which Belgium was distracted.
Split into simpler sentences: In 1855 he became Minister of the Interior and Prime Minister. He attempted, by combining the moderate elements of the Catholic and Liberal parties, the impossible task of resolving the educational and other questions by which Belgium was distracted.