Complex sentence: Ory was a banjo player during his youth, and it is said that his ability to play the banjo helped him develop "tailgate", a particular style of playing the trombone with a rhythmic line underneath the trumpets and cornets.
Split into simpler sentences: Ory was a banjo player during his youth and it is said that his ability to play the banjo helped him develop "tailgate", a particular style of playing the trombone. In "tailgate" style the trombone plays a rhythmic line underneath the trumpets and cornets.