Complex sentence: On 28 June 1976 Balmer (aged just 28 years) retired from his semi-professional football career and from then on he worked as a teacher in the Gymnasium in Interlaken and also as a sport journalist.
Split into simpler sentences: On 28 June 1976 Balmer (aged just 28 years) retired from his semi-professional football career. From then on he worked as a teacher in the Gymnasium in Interlaken and also as a sport journalist.