Complex sentence: The stadium had two very large covered stands that ran the length of the home and back straights and a third stand with terracing was constructed at the north end, on the south end was the totalisator with more terracing.
Split into simpler sentences: The stadium had two very large covered stands that ran the length of the home and back straights. A third stand with terracing was constructed at the north end, and on the south end was the totalisator with more terracing.