Complex sentence: Haarmann initially adapted to military life, and performed well as a trainee soldier; however, after five months of military service, he began to suffer periodic lapses of consciousness which would be diagnosed as being "equivalent to epilepsy" in October 1895.
Split into simpler sentences: Haarmann initially adapted to military life, and performed well as a trainee soldier. However, after five months of military service, he began to suffer periodic lapses of consciousness which would be diagnosed as being "equivalent to epilepsy" in October 1895.