Complex sentence: Patient navigators are also called "insurance navigators" or "in-person assisters" who have defined roles under the ACA; and although their roles might overlap, patient navigators are not community health workers or health advocates.
Split into simpler sentences: Patient navigators are also called "insurance navigators" or "in-person assisters" who have defined roles under the ACA. Although their roles might overlap, patient navigators are not community health workers or health advocates.