Complex sentence: In September 2007, Gibson introduced the DG-335, designed in collaboration with Dave Grohl, a variation on the Trini Lopez Gibson; the Grohl model has a stopbar tailpiece and Gibson's new Burstbucker humbuckers.
Split into simpler sentences: In September 2007, Gibson introduced the DG-335, designed in collaboration with Dave Grohl. The DG-335 is a variation on Trini Lopez's signature Gibson, essentially a Trini Lopez with a stopbar tailpiece and with Gibson's new Burstbucker humbuckers.