Complex sentence: American MPs were not well regarded by Australians as they were notorious for their arrogance and use of batons at the least provocation, when O'Sullivan raised his baton as if to strike one of the Australians they attacked him.
Split into simpler sentences: American MPs were not well regarded by Australians as they were notorious for their arrogance and use of batons at the least provocation. When O'Sullivan raised his baton as if to strike one of the Australians, they attacked him.