Complex sentence: The Springett Family had established themselves in Bowral upon the family opening a general store in 1926 and two decades later the Springett Family would expand this general store into a modern bakery and soft-drinks plant.
Split into simpler sentences: The Springett Family had established themselves in Bowral when they opened a general store in 1926. Two decades later the Springett Family expanded this general store into a bakery and soft-drinks plant.