Complex sentence: The California sea slug ("Aplysia californica ") is also commonly called the California sea hare, because the shape of all"Aplysia" species is reminiscent of the shape of a rabbit or hare.
Split into simpler sentences: The California sea slug ("Aplysia californica ") is also commonly called the California sea hare. This is because the shape of all"Aplysia" species is reminiscent of the shape of a rabbit or hare.