Complex sentence: Competing in 1A-Division 1 in Texas' University Interscholastic League (UIL), Port Aransas High School offers six varsity sports for boys and girls: basketball, baseball/softball, track and field, tennis, golf, and cross country.
Split into simpler sentences: Competing in 1A-Division 1 in Texas' UIL League, Port Aransas High School offers 6 varsity sports for boys and girls. Basketball, baseball/softball, track and field, tennis, golf, and cross country.