Complex sentence: This shirt policy was adopted to prevent non-KHS children from loitering on campus during school hours; however, this did not change any security at the school, because any person can go to the local Wal-Mart and buy the shirt.
Split into simpler sentences: This shirt policy was adopted to prevent non-KHS kids from hanging out on campus during school hours. This did not change any security at the school, because any person can go to the local wal-mart and buy the shirt.