Complex sentence: Crivelli seems to have worked chiefly in the March of Ancona, and especially in and near Ascoli Piceno; there are only two pictures remaining in Venice, in the church of San Sebastiano.
Split into simpler sentences: Crivelli seems to have worked chiefly in the March of Ancona, and especially in and near Ascoli Piceno. Only two pictures can be found today in Venice, both in the church of San Sebastiano.