Complex sentence: Goleman's population problems have been alleviated thanks to the creation of nearby Hialeah Gardens High School, the school population standing under 3,000 students is in contrast to the situation several years ago when it was near 4,500.
Split into simpler sentences: Goleman's population problems have been alleviated thanks to the creation of nearby Hialeah Gardens High School. The school population now stands under 3,000, in contrast to the situation several years ago when it was near 4,500.