Complex sentence: It is found in many forms in southern and eastern Australia (Victoria, NSW, ACT, SA, WA and on the island of Tasmania), the Tasmanian form being markedly smaller than the mainland Australian form.
Split into simpler sentences: It is found in many forms in southern and eastern Australia (Victoria, NSW, ACT, SA, WA and on the island of Tasmania). The Tasmanian form being markedly smaller than the mainland Australian form.