When you deal with natural light, mixed lighting situations are not rare. To rectify such mixed lighting situation, most of the photographers use white balancing. In addition to that, however, you should consider using a gradient effect in Adobe Lightroom. Such effect will help you balance the colors correctly with the other areas of the image.
By using gradients with a little bit of imagination, you will be able to add extra light, change the effect of the white balance, make it more sharpening and many other effects.