Simplify the following text for a Grade 11 native English-speaking person.
Original: The simians ( infraorder Simiiformes ) are the `` higher primates '' , closely related to Simmi , familiar to most people : the Old World monkeys and apes , including humans , ( together being the catarrhines ) , and the New World monkeys or platyrrhines .
Simplified: The simians ( infraorder Simiiformes ) are the `` higher primates '' familiar to most people are the Old World monkeys and apes , including humans and the New World monkeys .