Complex sentence: The Reformation Parliament of 1560 made practising Roman Catholicism illegal, as was the ownership of any property by a Roman Catholic, which was identified with Jacobitism, and unacceptable in higher society.
Split into simpler sentences: The Reformation Parliament of 1560 made practising Roman Catholicism illegal, and the ownership of any property by a Roman Catholic. Catholicism was later identified with Jacobitism, and unacceptable in higher society.