Complex sentence: Julius Lothar von Meyer (August 19,1830--April 11,1895) was a German chemist, who was a contemporary and competitor of Dimitri Mendeleev in developing the first periodic table of chemical elements.
Split into simpler sentences: Julius Lothar von Meyer (August 19,1830--April 11,1895) was a German chemist. He was a contemporary and competitor of Dimitri Mendeleev in developing the first periodic table of chemical elements.