Complex sentence: Measuring 13 to 14 cm in length, the White-rumped Robin has entirely black plumage, with a white rump and upper tail coverts, and white patches on its sides of its breast.
Split into simpler sentences: Measuring 13 to 14 cm, the White-rumped Robin has black plumage with a white rump and upper tail coverts. It has white patches on its sides of its breast.