Complex sentence: Johann Martin Lappenberg (July 30,1794-November 28,1865), German historian, was born at Hamburg, where his father, Valentin Anton Lappenberg (1759-1819), held an official position.
Split into simpler sentences: Johann Martin Lappenberg (July 30,1794-November 28,1865), was a German historian. He was born at Hamburg, where his father, Valentin Anton Lappenberg (1759-1819), held an official position.