Complex sentence: They are probably grazers by preference, feeding mainly on true grasses when available, such as scutch grass, and sedges, but they also eat herbs, fruits, and bark, as well as browsing on trees and shrubs.
Split into simpler sentences: They are probably grazers by preference, feeding mainly on true grasses when available, such as Scutch grass and sedges. But they also eat herbs, fruits, and bark as well as browsing trees and shrubs.