Complex sentence: Watercolor (American English) or watercolour (Commonwealth and Ireland), also "aquarelle" from French, is a painting method in which the paints are made of pigments suspended in a water-soluble vehicle.
Split into simpler sentences: Watercolor (American English) or watercolour (Commonwealth and Ireland), also "aquarelle" from French, is a painting method. A watercolor is the medium or the resulting artwork in which the paints are made of pigments suspended in a water-soluble vehicle.