Complex sentence: Berger enrolled as a mathematics student at the Friedrich Schiller University of Jena with a view to becoming an astronomer but after one semester, enlisted for a year of service in the cavalry.
Split into simpler sentences: Berger enrolled as a mathematics student at the Friedrich Schiller University of Jena with a view to becoming an astronomer. After one semester, he abandoned his studies and enlisted for a year of service in the cavalry.