Complex sentence: Christine's main source for information was Giovanni Boccaccio's "De mulieribus claris" (On Famous Women), possibly in the French version, "Des Cleres et Nobles Femmes".
Split into simpler sentences: Christine's main source for information was Giovanni Boccaccio's "De mulieribus claris" (On Famous Women). Christine may have read Boccaccio's "De mulieribus claris" in the French version "Des Cleres et Nobles Femmes".