Complex sentence: In 1827 Julin founded shipping company "E. Julin & C." which during years 1827--1856 possessed seven merchant ships and in addition it most likely had partial ownership for some other vessels.
Split into simpler sentences: In 1827 Julin founded shipping company "E. Julin & C." which during years 1827--1856 possessed seven merchant ships. The company most likely had partial ownership for some other vessels.