Complex sentence: However, Thatcher did write that he left with "courteousness and good humour" which was in contrast to Ian Gilmour who having left the cabinet in the same reshuffle, stormed out of Downing Street, announcing that government policy was "heading for the rocks".
Split into simpler sentences: However, Thatcher did write that he left with "courteousness and good humour" which was in contrast to Ian Gilmour who left the cabinet in the same reshuffle. Gilmour came storming out of Downing Street, announcing that government policy was "heading for the rocks".