Complex sentence: The International High School of San Francisco (familiarly known as International or IHS) is a private high school affiliated with the French American International School (San Francisco) ("FAIS") located in the Hayes Valley neighborhood of San Francisco, California.
Split into simpler sentences: The International High School of San Francisco (familiarly known as International or IHS) is a private high school affiliated with the French American International School (San Francisco) ("FAIS"). International is located in the Hayes Valley neighborhood of San Francisco, California.