Complex sentence: He continued in both roles until he entered the House of Commons as an MP and became known for his dedicated activism and rebelliousness, frequently voting against the Labour whip when the party was in government under Tony Blair and Gordon Brown.
Split into simpler sentences: He continued in both roles until he entered the House of Commons as an MP. He is known for his dedicated activism and rebelliousness, frequently voting against the Labour whip when the party was in government under Tony Blair and Gordon Brown.