Complex sentence: As a planula settles down, it gives rise to a colony of polyps that are attached to the sea-floor.the polyps form into an extensively branched form, which is noot commonly see in mot jellyfish.
Split into simpler sentences: As a planula settles down, it gives rise to a colony of polyps that are attached to the sea-floor. The polyps form into an extensively branched form, which is not commonly seen in mot jellyfish.