Complex sentence: He established the free jazz band Finnerud Trio (1967-74), including Bjørnar Andresen and drummer Espen Rud, as with their Paul Bley inspired musical expression also frequented international jazz festivals, including Warszawa (1970).
Split into simpler sentences: He established the free jazz band Finnerud Trio (1967-74), with Bjørnar Andresen and drummer Espen Rud. With their Paul Bley inspired musical expression, they played at a number of international jazz festivals, including Warszawa (1970).