Complex sentence: All high school students in the county's Deaf and Hard of Hearing (Deaf/HOH) 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 (Deaf/HOH) program attend classes at Leigh, with varying degrees of success. Some of these take sheltered classes with other deaf students, but many of whom are mainstreamed into classes with Leigh's hearing population.