Complex sentence: When all three fatty acids have the formula CnH2n +1CO2H, the resulting fat is called "saturated", because the carbon atoms are saturated with hydrogen; meaning they are bonded to as many hydrogens as possible.
Split into simpler sentences: When all three fatty acids have the formula C n H (2n +1) CO 2 H, the resulting fat is called "saturated". Each carbon atom in the chain is saturated with hydrogen, meaning they are bonded to as many hydrogens as possible.