Complex sentence: All high school students in the county's Deaf and Hard of Hearing program attend classes at Leigh, some of whom take sheltered classes with other deaf students, but many of whom are mainstreamed into classes with Leigh's hearing population.
Split into simpler sentences: All high school students in the county's Deaf and Hard of Hearing program attend classes at Leigh. Some take sheltered classes with other deaf students, but many are mainstreamed into classes with Leigh's hearing population.