Complex sentence: El Puerto has a famous bull ring which dates back to 1880 with space for 15,000 spectators and bull fighting is still enjoyed during the Feria season, which are during the month of August and during the Feria de la Primavera which is in early May.
Split into simpler sentences: El Puerto has a famous bullring which dates back to 1880 with space for 15,000 spectators. Bullfighting is still enjoyed during the Feria season during the month of August, and during the "Feria de la Primavera" (Spring Fair) in early May.