Complex sentence: In the amateur Rugby Union era Ulster regularly played international touring sides from the southern hemisphere, their most impressive performance coming in the 1984/5 season when they defeated Andrew Slack's "Grand Slam" Wallabies.
Split into simpler sentences: In the amateur rugby union era, Ulster regularly played international touring sides from the southern hemisphere. Their most impressive performance was in the 1984/5 season when they defeated Andrew Slack's "Grand Slam" Wallabies.