Simplify the following text for a Grade 10 native English-speaking person.
Original: The Constitution states that the vice president becomes president upon the removal from office , death or resignation of the preceding president . If the offices of president and vice president both are either vacant or have a disabled holder of that office , the next officer in the presidential line of succession , the Speaker of the House , becomes acting president .
Simplified: Presidents may be replaced by the Acting President , usually his or her Vice President .