Complex sentence: Decades separated the youngest from the eldest; many were employed as commercial artists while others pursued careers as art teachers; several had studied under the American abstract expressionist Hans Hofmann; and others had little to no formal training.
Split into simpler sentences: Decades separated the youngest from the eldest, many were employed as commercial artists while others pursued careers as art teachers. Several had studied under the American abstract expressionist Hans Hofmann and others had little to no formal training.