Simplify the following text for a Grade 8 native English-speaking person.
Original: Theobromine , also known as xantheose , is a bitter alkaloid of the cacao plant , found in chocolate , as well as in a number of other foods , including the leaves of the tea plant , and the kola or cola nut .
Simplified: Theobromine is a chemical substance , also known as xantheose It is an alkaloid . It occurs in the cacao plant .