Complex sentence: In February 1969 O'Neill called a surprise general election because of the turmoil inside the Ulster Unionist Party: ten to 12 anti-O'Neill dissident members of the Unionist Parliamentary Party opposed his leadership; and Brian Faulkner resigned from the Government.
Split into simpler sentences: In February 1969 O'Neill called a surprise general election because of the turmoil inside the UUP. About ten to twelve dissident MPs opposed his leadership, and Brian Faulkner resigned from the Government.