Complex sentence: The Blue Lake is one of only four cirque lakes found in mainland Australia, the other three, Cootapatamba, Albina, and Club are shallower than BL and are held entirely by terminal moraines.
Split into simpler sentences: The Blue Lake is one of only four cirque lakes found in mainland Australia. The other three, Cootapatamba, Albina, and Club, are shallower and are held entirely by terminal moraines.