Complex sentence: Widely recognized as a pioneer, Grand Mixer DXT is credited for being the first to establish the turntable as a fully performable and improvisational musical instrument (Alberts 2002).
Split into simpler sentences: Widely recognized as a pioneer, Grand Mixer DXT is credited for being the first Turntablist. He's the first person to establish the turntable as a fully performable and improvisational musical instrument (Alberts 2002).