Complex sentence: The "Greatest Hits Video Collection" DVD was also released at the same time, which compiled all of the Pumpkins promo videos from "Gish" to "Machina" along with unreleased material.
Split into simpler sentences: The "Greatest Hits Video Collection" DVD was also released at the same time. This was a compilation of all of the Pumpkins promo videos from "Gish" to "Machina" along with unreleased material.