Complex sentence: He temporarily left Presto Studios to work for e-tractions, a marketing group, only to later return to help with the AI on the Xbox Live version of "Whacked!" (2002).
Split into simpler sentences: He temporarily left Presto Studios to work for e-tractions, a marketing group. He then returned to Presto Studios and helped with the AI on the Xbox Live version of "Whacked!" (2002).