Complex sentence: West is one of the best-selling and among the most awarded artists in popular music; he has won a total of 21 Grammy Awards, making him one of the most awarded artists of all-time and the most awarded artist of anyone his age.
Split into simpler sentences: West is one of the best-selling and among the most awarded artists in popular music. West has won a total of 21 Grammy Awards, making him one of the most awarded artists of all-time and the most awarded artist of anyone his age.