Complex sentence: There are 17 subspecies from Alaska to Nica ­ ragua, 8 north of Mexico: macrolopha of the central and southern Rockies, sterlleri (Pacific coast from Alaska to southwestern British Columbia), and the largest subspecies, carlottae, from the Queen Charlotte Islands.
Split into simpler sentences: There are 17 subspecies from Alaska to Nica ­ ragua, 8 found north of Mexico. To name a few: macrolopha of the central and southern Rockies, sterlleri (Pacific coast from Alaska to southwestern British Columbia), and the largest subspecies, carlottae, from the Queen Charlotte Islands.