Simplify the following text for a Grade 13 native English-speaking person.
Original: The Niger-Congo languages constitute one of the world 's major language families , and Africa 's largest in terms of geographical area , number of speakers , and number of distinct languages .
Simplified: The Niger-Congo languages are one of the world 's major language families , and Africa 's largest in terms of geographical area , number of speakers , and number of distinct languages .