Complex sentence: In 1913 Lorents graduated from the Faculty of Law at Saint Petersburg University and went onto further study at the Mikhailovsk Artillery School graduating in 1915, at which stage he went into service in the Russian Army.
Split into simpler sentences: In 1913 Lorents graduated from the Faculty of Law at Saint Petersburg University and went on to study at the Mikhailovsk Artillery School, where he graduated in 1915. Subsequent to graduation, he went into service in the Russian Army.