Simplify the following text for a Grade 7 native English-speaking person.
Original: During the following months , Monroe 's dependence on alcohol and prescription medications began to take a toll on her health , and friends such as Susan Strasberg later spoke of her illness .
Simplified: During the following months , Monroe 's need for alcohol and prescription medications began to take a toll on her health . Friends such as Susan Strasberg later spoke of her illness .