Complex sentence: The bomb was planted by Provisional Irish Republican Army (IRA) member Patrick Magee, with the intention of assassinating UK Prime Minister Margaret Thatcher and her cabinet, who were staying at the hotel for the Conservative Party conference.
Split into simpler sentences: The bomb was planted by Provisional Irish Republican Army (IRA) member Patrick Magee. It was intended to assassinate Prime Minister Margaret Thatcher and her cabinet, who were staying at the hotel for the Conservative Party conference.