For example, the temperate deciduous forest biome, which covers most of eastern Canada and the United States, is divided by some ecologists into three biomes.
(the temperate deciduous forest biome; covers; most of eastern Canada and the United States) (the temperate deciduous forest biome, which covers most of eastern Canada and the United States; is divided; by some ecologists; into three biomes)
the temperate deciduous forest biome the temperate deciduous forest biome, which covers most of eastern Canada and the United States
covers is divided
most of eastern Canada and the United States
by some ecologists into three biomes