Complex sentence: Leadsom's withdrawal from the election on 11 July led to May's appointment as leader the same day; she was appointed prime minister two days later, making her the second female Prime Minister of the United Kingdom, the first being Margaret Thatcher.
Split into simpler sentences: Leadsom's withdrawal from the election on 11 July led to May's appointment as leader the same day; she was appointed prime minister two days later. She is the second female Prime Minister of the United Kingdom, the first being Margaret Thatcher.