Complex sentence: Millican was also responsible for selecting the official colors of the university, and had a role in selecting its first mascot-the Citronaut, a mix between an orange and an astronaut.
Split into simpler sentences: Millican was also responsible for selecting the official colors of the university, and had a role in selecting its first mascot. The university's first mascot was the Citronaut, a mix between an orange and an astronaut.