Complex sentence: Established in 1905 and developed as a result of the 1920 discovery of oil in the Huntington Beach Oil Field, the census-designated place was annexed by Huntington Beach in 2011.
Split into simpler sentences: Established in 1905 and developed as a result of the 1920 discovery of oil in the Huntington Beach Oil Field. The census-designated place was annexed by Huntington Beach in 2011.