Complex sentence: The guitar players double on ukuleles, mandolins, electric guitars and acoustic guitars, the percussionist doubles on the bongos, glockenspiel, xylophone, woodblocks, timpani, congas, tambourine, and a shaker.
Split into simpler sentences: The guitar players double on ukuleles, mandolins, electric guitars and acoustic guitars. The percussionist doubles on the bongos, glockenspiel, xylophone, woodblocks, timpani, congas, tambourine, and a shaker.