Complex sentence: The caribou is a specialist that is well adapted to cooler climates with fur with hollow hair, that covers almost all of its body including its nose, and provides insulation in winter and flotation for swimming.
Split into simpler sentences: The caribou is a specialist that is well adapted to cooler climates with a fur that covers almost all of its body including its nose. The hollow-hair of its fur not only provides insulation in winter and flotation for swimming.