Complex sentence: Niels Henrik David Bohr (7 October 1885--18 November 1962) was a Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922.
Split into simpler sentences: Niels Henrik David Bohr (7 October 1885--18 November 1962) was a Danish. He made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922.