Complex sentence: Once in Australia, many of these prisoners continued to plan escapes from British military custody--for example, the 1804 Castle Hill convict rebellion, and continual tension on Norfolk Island in the same year also led to an Irish revolt.
Split into simpler sentences: Once in Australia, some of these prisoners continued to plan escapes from British military custody, an example being the 1804 Castle Hill convict rebellion. Continual tension on Norfolk Island in the same year also led to an Irish revolt.