Complex sentence: Tim began his career at Breadsmith shortly after the first store opening in 1993, he has managed a store as well as worked in several positions including head of research and development and vice president before being promoted to president.
Split into simpler sentences: Tim began his career at Breadsmith shortly after the first store opening in 1993. He has managed a store, as well as worked in several positions including head of research and development and vice president before being promoted to president.