Complex sentence: Hans Stadlmair was the artistic director from 1956 to 1995, and conducted the orchestra in over 4000 concerts, including international tours and collaborations with the Bayerischer Rundfunk.
Split into simpler sentences: Hans Stadlmair was the artistic director from 1956 to 1995. He conducted the orchestra in more than 4000 concerts, also on international tours and in collaboration with the Bayerischer Rundfunk.