Simplify the following text for a Grade 12 native English-speaking person.
Original: Freud believed that people are driven by two conflicting central desires : the life drive ( libido or Eros ) ( survival , propagation , hunger , thirst , and sex ) and the death drive .
Simplified: Freud believed that humans were driven by two conflicting central desires : the life drive ( survival , propagation , hunger , thirst , and sex ) and the death drive ( Thanatos ) .