Complex sentence: Tasmania's rainforest are classified as cool temperate rainforests where it is defined when the annual rainfall exceeds 1400 mm per year or when the summer rainfall exceeds 50 mm per month which occurs mainly in the western half of Tasmania and in the northen-eastern highlands.
Split into simpler sentences: Tasmania's rainforest are classified as cool temperate rainforests where the annual rainfall exceeds 1400 mm per year or when the summer rainfall exceeds 50 mm per month. It occurs mainly in the western half of Tasmania and in the northen-eastern highlands.