Complex sentence: Due to economic hardship, military service has been seen as an opportunity in American Samoa and other US Overseas territories; this has meant that there have been a disproportionate number of casualties per population compared to other parts of the United States.
Split into simpler sentences: Due to economic hardship, military service has been seen as an opportunity in American Samoa and other US Overseas territories. This has meant that there have been a disproportionate number of casualties per population compared to other parts of the United States.