Complex sentence: Sweetwater Union High School (commonly known as SUHI), located in National City, California, United States, is a high school established in 1921, and consequently, is one of the oldest high schools in San Diego County.
Split into simpler sentences: Sweetwater Union High School (commonly known as SUHI), located in National City, California, United States, is a high school established in 1921. It is one of the oldest high schools in San Diego County.