Complex sentence: His work has been the subject of several studies (see articles in Duncan 1978; cf. Ghani 1998; Lauria-Perriceli 1989; Scott 2004), in addition to his reflections on his own ideas and fieldwork (Mintz 1989,2002).
Split into simpler sentences: His work has been the subject of several studies (see articles in Duncan 1978; cf. Ghani 1998; Lauria-Perriceli 1989; Scott 2004). He has reflected on his own ideas and fieldwork (Mintz 1989,2002).