Complex sentence: In 1841, Marshall Mount House was completed as the Osborne's new residence and in 1843, Osborne held a cattle show at his property which led to the founding of the Illawarra Agricultural Association.
Split into simpler sentences: In 1841, Marshall Mount House was completed as the Osborne's new residence. In 1843, Osborne held a cattle show at his property which led to the founding of the Illawarra Agricultural Association.