Simplify the following text for a Grade 6 native English-speaking person.
Original: Calvin gave himself and Hobbes important positions in the club , Calvin being `` Dictator-for-Life '' and Hobbes being `` President-and-First-Tiger '' .
Simplified: The club has only two members , Calvin and Hobbes . Calvin is `` supreme dictator-for-life '' and Hobbes is the `` first tiger '' .