Simplify the following text for a Grade 9 native English-speaking person.
Original: The Leader of the Opposition is often seen as the alternative Prime Minister , Premier or Chief Minister to the present incumbent , and heads a rival alternative government known as the Shadow Cabinet or Opposition Front Bench .
Simplified: The Leader of the Opposition is often seen as the alternative Prime Minister , Premier or Chief Minister . They lead an alternative government known as the Shadow Cabinet or Opposition Front Bench .