Complex sentence: They have the ability to project these captured souls into animals and other non-sentient lifeforms; however, it is unknown if a Slide can project his own soul in such a manner, or needs another soul to'hitch a ride' on.
Split into simpler sentences: They have the ability to project these captured souls into animals and other lifeforms. It is, however, unknown if a Slide can project its own soul in such a manner, or whether it needs another soul to'hitch a ride' on.