Simplify the following text for a Grade 7 native English-speaking person.
Original: The name Limmat originates as a combination of the names of the Linth and Maag rivers , the main tributaries of the lake of Zurich before the construction of the Linth canal .
Simplified: Its name comes from Linth and Maag the main tributaries of the lake of ZÃ 1\/4 rich .