Complex sentence: Albert was 14 when he arrived in Boston and diligently worked his way into a responsible position in the food and beverage wholesale distribution business, and later opened his own grocery and wine store in the Allston neighborhood of Boston.
Split into simpler sentences: Albert was 14 when he arrived in Boston and worked in the food and beverage wholesale distribution business. Later he opened his own grocery and wine store in the Allston neighborhood of Boston.