Complex sentence: When the colony in Albany was first settled in 1826 Green Island was planted for vegetables and by 1830 supported a vegetable garden and a hut was erected on the island for the gardener to live in.
Split into simpler sentences: When the colony in Albany was first settled in 1826, Green Island was planted for vegetables. By 1830 it supported a vegetable garden, and a hut was erected on the island for the gardener to live in.