Complex sentence: The Lānai Hookbill was a plump, medium-sized bird with greenish olive upperparts and pale whitish yellow underparts, as well as a yellow or white superciliary line and a white chin and throat.
Split into simpler sentences: The Lānai Hookbill was a plump, medium-sized bird with greenish olive upperparts and pale whitish yellow underparts. It also had a yellow or white superciliary line and a white chin and throat.