Complex sentence: Newly elected National Prime Minister Robert Muldoon refused to cancel the tour, which went ahead, in spite of the (then draft) Gleneagles Agreement where Commonwealth leaders agreed to discourage sporting contact with South Africa.
Split into simpler sentences: Newly elected National Prime Minister Robert Muldoon refused to cancel the tour, which went ahead. The (then draft) Gleneagles Agreement where Commonwealth leaders agreed to discourage sporting contact with South Africa.