Complex sentence: He attended the SA-sports school in Hammerstein for a few weeks in 1934 and in 1935 spent his summer vacation in Bulgaria where he, among other places, stayed at the Rila Monastery.
Split into simpler sentences: He attended the SA-sports school in Hammerstein for a few weeks in 1934. He spent his 1935 summer vacation in Bulgaria where he, among other places, stayed at the Rila Monastery.