A Divine Clone is created when the creator of a Divine Spark decides not to fuse with it, in order to keep studying the Profound Laws of other ways, and lets it hover outside of the body for a time.
Creating a Divine Clone allows one to keep studying the ways of other Profound Laws while at the same time the Divine Clone can keep on gaining insights into the specific Elemental Law its Divine Spark was based on. In Linley's case, his first Divine Clone was created form a Wind-style Divine Spark, which made it so that it coulnd only progress on that specific path.
The major downside of creating Divine Clones is that it will tear one's original soul in two parts as one half will remain inside the original normal body, whereas the other half will go into the clone's divine body. This process severely weakens one's soul.
The benefits generally outweigh the downsides though. The damage to the soul caused by the soul splitting was only temporary, after all. But what it represented was an additional life, as well future possibilities for further training! After all, after one became a Deity, one would have an unlimited lifespan. One could train in the other Elemental Laws.
The soul in the original body and in its Divine Clone are the same. Naturally, the divine artifacts as well as blood-bound items could be utilized by either the original body or the divine clone.
Linley kept his Wind-style Divine Clone inside of his soulspace and was able to swap between the two bodies, the clone and his original one, at his own leisure.
The original body is capable of borrowing the powers of the Divine Clone, or if possible, from multiple Divine Clones resulting in the mixture of different Profound Laws like Earth and Wind. The borrowed power is, however, weaker than when the original body would be swapped with the Divine Clone. The downside here is that there cannot be a mixture of Profound Laws then, as each individual Clone is limited by their own Elemental Laws.