Complex sentence: She attended Alexander Hamilton High School where she became popular with her class, she in turn also attended the same high school as did Joel Siegel, Al Michaels and Michelle Phillips (who would later co-star with her in "Knots Landing") did.
Split into simpler sentences: She attended Alexander Hamilton High School where she became popular with her class. She in turn also attended the same high school as did Joel Siegel, Al Michaels and Michelle Phillips (who would later co-star with her in "Knots Landing") did.