Complex sentence: These largely solitary birds feed on fruits, berries, insects and small vertebrates (e.g. frogs), and can, despite the bright plumage, be surprisingly difficult to see in their wooded habitats.
Split into simpler sentences: These largely solitary birds feed on fruits, berries, insects and small vertebrates (such as frogs). Despite their bright plumage, they can be surprisingly difficult to see in their wooded habitats.