Complex sentence: Born to the family of hereditary military officers, he enlisted in the Leib Guard in 1740, and in 1757 he fought and was injured in the Battle of Gross-Jägersdorf.
Split into simpler sentences: Born to the family of hereditary military officers, he enlisted in the Leib Guard in 1740. In 1757 he fought and was injured in the Battle of Gross-Jägersdorf.