Complex sentence: Inhaled (huffed) gasoline vapor is a common intoxicant that has become epidemic in some poorer communities and indigenous groups in Australia, Canada, New Zealand, and some Pacific Islands.
Split into simpler sentences: Inhaled (huffed) gasoline vapor is a common intoxicant. Gasoine inhaling has become epidemic in some poorer communities and indigenous groups in Australia, Canada, New Zealand, and some Pacific Islands.