Complex sentence: Like all triglycerides (fats and oils), MCTs are composed of a glycerol backbone and three fatty acids; in the case of MCTs, 2 or 3 of the fatty acid chains attached to glycerol are medium chain in length.
Split into simpler sentences: Like all triglycerides (fats and oils), MCTs are composed of a glycerol backbone and three fatty acids. In the case of MCTs, 2 or 3 of the fatty acid chains attached to glycerol are medium-chain in length.