Simplify the following text for a Grade 6 native English-speaking person.
Original: He served as a Member of Parliament from 1970 until 1995 and as Labor Leader and Leader of Her Majesty 's Loyal Opposition from 1983 until 1992 .
Simplified: He was a Member of Parliament from 1970 to 1995 . From 1983 to 1992 he was the leased of the Leader of the Opposition and Labor Party .