Complex sentence: The art was often made through the collaborative process, and the Taller took the anti-commercial policy of not numbering prints, but it sold prints as part of and was the first political publishing workshop in Mexico to do so.
Split into simpler sentences: The art was often made through the collaborative process, and the Taller took the anti-commercial policy of not numbering prints. However, it did sell prints as part of and was the first political publishing workshop in Mexico to do so.