Complex sentence: She also taught art therapy through the Dorothy Royer School and at various colleges and schools, including Long Beach State College and UCLA Extension, and maintained a private practice as an art therapist for thirty years.
Split into simpler sentences: She also taught art therapy through the Dorothy Royer School and at various colleges and schools, including California State University, Long Beach, and the University of California, Los Angeles, Extension. She maintained a private practice as an art therapist for thirty years.