Complex sentence: The species is a very distinctive member of the storm-petrel family, with a dark cap, white face and underparts, aforked tail and a black band across the chest, and is relatively common in the seas off Peru, Chile and Ecuador.
Split into simpler sentences: The species is a very distinctive member of the storm-petrel family, with a dark cap, white face and underparts, forked tail and a black band across the chest. It is relatively common in the seas off Peru, Chile and Ecuador.