Complex sentence: The IRA claimed they were targeting a Loyalist meeting above the fish shop when the bomb exploded prematurely as it was being planted; nine people were killed in addition to one of the bombers, Thomas Begley.
Split into simpler sentences: The IRA claimed they were targeting a meeting of loyalists above the fish shop when the bomb exploded prematurely as it was being planted. Nine people were killed in addition to one of the bombers, Thomas Begley.