Complex sentence: Niels Kaare Krabbe (born 1 July 1951) is an ornithologist and bird conservationist based at the Vertebrate Department of the Zoological Museum, University of Copenhagen, researching various aspects of ornithology, especially bioacoustics and conservation; systematics and altitudinal replacements of "Scytalopus" tapaculos.
Split into simpler sentences: Niels Kaare Krabbe (born 1 July 1951) is an ornithologist and bird conservationist based at the Vertebrate Department of the Zoological Museum, University of Copenhagen. His research interests include various aspects of ornithology, especially bioacoustics, conservation, and systematics and altitudinal replacements of "Scytalopus" tapaculos.