Complex sentence: The Ulster Constitution Party was an Unionist political party in Northern Ireland active in the early 1970s, formed by two Belfast City Council councillors, David M. Riddelsdell and Robert Lindsay Mason.
Split into simpler sentences: The Ulster Constitution Party was an Unionist political party in Northern Ireland active in the early 1970s. The party was established by two Belfast City Council councillors, David M. Riddelsdell and Robert Lindsay Mason.