Complex sentence: In general, however, their style was more eclectic, and in part because they began their careers during the Great Depression, they felt it was important for architects to work on developing ways to work economically and with new materials.
Split into simpler sentences: In general, however, their style was more eclectic. In part because they began their careers during the Great Depression, they felt it was important for architects to work on developing ways to work economically and with new materials.