Simplify the following text for a Grade 10 native English-speaking person.
Original: While most green leafy vegetables and other sources of lycopene are low in fats and oils , lycopene is insoluble in water and is tightly bound to vegetable fiber . Processed tomato products such as pasteurized tomato juice , soup , sauce , and ketchup contain the highest concentrations of bioavailable lycopene from tomato-based sources .
Simplified: Ketchup contains the highest concentrations of bioavailable lycopene .