Complex sentence: During his parliamentary career as an M.P., he had been Colonial Secretary, and being opposed to Harold MacMillan's' Winds of Change' speech he subsequently became an early Patron of the Conservative Monday Club.
Split into simpler sentences: During his parliamentary career as an M.P., he had been Colonial Secretary. Being opposed to the line taken in Harold MacMillan's Wind of Change speech, he subsequently became an early Patron of the Conservative Monday Club.