Complex sentence: Approximately one year later, Thompson began to occasionally voice and perform Geoff live in-studio, and on May 16,2011, in a possible backdoor audition, Thompson performed Geoff in an actual guest spot.
Split into simpler sentences: Approximately one year later, Thompson began to occasionally voice and perform Geoff live in-studio. On May 16,2011, in what was possibly a backdoor audition, Thompson performed Geoff Peterson in an actual guest spot.