Complex sentence: "Have You Seen This Snail" was written by Aaron Springer and Paul Tibbitt and directed by Springer, and guest-starred Amy Poehler as Grandma and Stew, who performed the musical number "Gary, Come Home".
Split into simpler sentences: Have You Seen This Snail was written by Aaron Springer and Paul Tibbitt and directed by Springer. Stew performed the musical number "Gary, Come Home".