Complex sentence: Some detractors of SEE claim that teaching deaf children SEE deprives them of belonging to a culture that they can fully participate in; however, children who began using SEE in the 1970s are now Deaf Adults themselves and can speak to this concern.
Split into simpler sentences: Some detractors of SEE claim that teaching deaf children SEE deprives them of belonging to a culture in which they can fully participate. However, children who began using SEE in the 1970s are now Deaf Adults themselves and can speak to this concern.