Complex sentence: He acceded to the peerage upon his father's death on 4 February 1970, but disclaimed it on 23 February, to continue as MP and government minister, but insisted on being called Lord Lambton, his former courtesy title.
Split into simpler sentences: He acceded to the peerage upon his father's death on 4 February 1970, but disclaimed it on 23 February. He disclaimed his peerage to continue as MP and government minister, but insisted on being called Lord Lambton, his former courtesy title.