Complex sentence: Her first beauty pageant was the Miss San Jacinto which she entered when she was 13; at 19, she won Miss Citrus Valley USA which qualified her to take part in the Miss Latino competition in Ecuador.
Split into simpler sentences: Her first beauty pageant was the Miss San Jacinto at age 13. Winning Miss Citrus Valley USA at age 19 qualified her to compete in the Miss Latino competition in Ecuador.