Complex sentence: Faucounau refers to the bipartite classification as "Risch-Chadwick theory", after Ernst Risch and John Chadwick, two notable proponents, himself favouring the tripartite classification, attributing the latter to three consecutive "waves" of Hellenic immigration to the Greek mainland.
Split into simpler sentences: Faucounau refers to the bipartite classification as "Risch-Chadwick theory", after two famous proponents of it, Ernst Risch and John Chadwick. Faucounau himself favours the tripartite classification, and attributes the latter to three consecutive "waves" of Hellenic immigration to the Greek mainland.