Complex sentence: Armed guards were placed in the narrow passage between Levuka and Yanuca Lailai, to prevent contact with the new arrivals and on several instances warning shots had to be fired to prevent seamen trying to return to the Leonidas after dropping off their passengers.
Split into simpler sentences: Armed guards were placed in the narrow passage between Levuka and Yanuca Lailai, to prevent contact with the new arrivals. On several ocassions warning shots had to be fired to prevent seamen trying to return to the Leonidas after dropping off their passengers.