Complex sentence: At the age of fourteen she had joined the Conservative Party, after being inspired by then-Prime Minister Margaret Thatcher, but in 1996 she briefly switched to Tony Blair's Labour Party saying she believed him to be "socially liberal but an economic Tory".
Split into simpler sentences: At the age of fourteen she joined the Conservative Party, after being inspired by then-Prime Minister Margaret Thatcher. In 1996, however, she briefly switched to Tony Blair's Labour Party saying she believed him to be "socially liberal but an economic Tory".