Complex sentence: He had been playing the blues since his teens, and he borrowed both guitar riffs and showmanship techniques from blues player T-Bone Walker, as well as taking guitar lessons from his friend Ira Harris that laid the foundation for his guitar style.
Split into simpler sentences: He had been playing the blues since his teens, and he borrowed both guitar riffs and showmanship techniques from the blues musician T-Bone Walker. He also took guitar lessons from his friend Ira Harris, which laid the foundation for his guitar style.