Complex sentence: In years past many of grapes grown in Madera were used for the production low-priced wines, today the grapes are shipped to producers of wines throughout the state including Napa and Sonoma.
Split into simpler sentences: In years past, many of the grapes grown in Madera were used for the production of low-priced wines. Today the grapes are shipped to producers of wines throughout the state, including Napa and Sonoma.