Complex sentence: The three had worked on a Porto-Ghost Portal that backfired and caused Vlad to come down with ecto-acne due to Jack's accident of spilling diet soda into the machine instead of ecto-purifier.
Split into simpler sentences: The three had worked on a Porto-Ghost Portal that backfired and caused Vlad to come down with ecto-acne. This was due to Jack accidentally spilling diet soda into the machine instead of ecto-purifier.