Complex sentence: At the outbreak of World War I, Abercron was appointed commander of the newly founded Reserve-Infanterie-Regiment, which he commanded at the Western Front as well as in the Battle of Verdun.
Split into simpler sentences: At the outbreak of World War I, Abercron was appointed commander of the newly founded Reserve-Infanterie-Regiments. With this he commanded the Western Front as well as in the Battle of Verdun.