Complex sentence: Karl Leonhard Reinhold (26 October 1757--10 April 1823) was an Austrian philosopher who helped to popularise the work of Immanuel Kant in the late 18th century.
Split into simpler sentences: Karl Leonhard Reinhold (26 October 1757--10 April 1823) was an Austrian philosopher. Reinhold helped to popularize the work of Immanuel Kant in the late 18th century.