Mostly. The rest is told in Advent Children and related books. Though Sephiroth's depiction with his one wing of white ...

The Sephiroth triplets were bad but so was relying ... but it would not have happened if not for Advent Children’s choreography. On the downside to that, some of the visuals look dated.

Amazingly, this Sephiroth figure also comes with an alternate body that shows off his shirtless figure. Final Fantasy VII Advent Children Play Arts Kai Sephiroth Action Figure Depicting a version ...