Complex sentence: Lord Abergavenny became a Knight of St John in 1976, a Knight of the Garter in 1974 and was Chancellor of that Order between 1977 and 1994.
Split into simpler sentences: Lord Abergavenny became a Knight of St John in 1976. He later became a Knight of the Garter in 1974 and was Chancellor of that Order between 1977 and 1994.