Complex sentence: Since there are very few commercially available coldwater fish and invertebrates, hobbyists usually have to physically acquire specimens, although recently more specimens have become commercially available from the west coast of the United States as well as Japan, Australia, and the UK.
Split into simpler sentences: Since there are very few commercially available coldwater fish and invertebrates, hobbyists usually have to physically acquire specimens. Recently more specimens have become commercially available from the West coast of the United States as well as Japan, Australia, and the UK.