Complex sentence: The Oregon wine industry started to rebuild in the 1960s, when California winemakers opened several vineyards in the state, including Pinot Noir grapes in the Willamette Valley, a region long thought too cold to be suitable for viticulture.
Split into simpler sentences: The Oregon wine industry started to rebuild in the 1960s, when California winemakers opened several vineyards in the state. This included the planting of Pinot Noir grapes in the Willamette Valley, a region long thought too cold to be suitable for viticulture.