Original: Søren Aabye Kierkegaard (or;) (5 May 1813 - 11 November 1855) was a prolific 19th century Danish philosopher and theologian.
Simplified: Søren Aabye Kierkegaard (5 May, 1813 - 11 November, 1855), a 19th century Danish philosopher and theologian, is usually thought of as the first existentialist philosopher.