Complex sentence: Marley remains the most widely known and the best-selling performer of reggae music, having sold more than 75 million albums worldwide and is credited with helping spread both Jamaican music and the Rastafari movement to a worldwide audience.
Split into simpler sentences: Marley remains the most widely known and the best-selling performer of reggae music, having sold more than 75 million albums worldwide. And is credited with helping spread both Jamaican music and the Rastafari movement to a worldwide audience.