Simplify the following text for a Grade 8 native English-speaking person.
Original: Spacewatch is a project at the University of Arizona currently led by Dr. Robert S. McMillan that specializes in the study of minor planets , including various types of asteroids and comets .
Simplified: Spacewatch is a project at the University of Arizona that studies minor planets , as well as asteroids and comets . The person in charge of Spacewatch is Dr. Robert S. McMillan .