Complex sentence: If McCoy and Cutter had consulted Olivet and learned her objections before putting Stronach on the stand, they would have then had another alternative--namely, not putting Stronach on the stand.
Split into simpler sentences: If McCoy and Cutter had consulted Olivet before putting Stronach on the stand, they would have learned Olivet's objections beforehand. They would have then had another alternative--namely, not putting his witness on the stand.