Complex sentence: Friedman (1987) ch.3 RJE seems to have omitted large parts of E, and perhaps some of J in the process; though he may have had a fragmentary E source to begin with.
Split into simpler sentences: Friedman (1987) ch.3 RJE seems to have omitted large parts of E, and perhaps some of J in the process. It is also possible he had had a fragmentary E source to begin with.