Simplify the following text for a Grade 9 native English-speaking person.
Original: Endemol was founded in 1994 by a merger of television production companies owned by Joop van den Ende and John de Mol , the name deriving from the combination of their surnames .
Simplified: Endemol was founded in 1994 with the combining of the television companies owned by Joop van den Ende and John de Mol . The name of the company comes from the combination of their surnames ( Ende + Mol ) .