Complex sentence: His keyboard arsenal grew to include an E-MU Emax, Roland R-8 drum machine and a Yamaha C1 music computer, one of the first MS-DOS computers made to run music software.
Split into simpler sentences: His keyboard arsenal grew, to included an E-MU Emax, Roland R-8 drum machine and a Yamaha C1 music computer. One of the first MS-DOS computers made to run music software.