Simplify the following text for a Grade 6 native English-speaking person.
Original: This is the so-called ` Nexus ' , which is designed to prevent swamping of the senate 's power in the case of a joint sitting ( see Section 57 below ) .
Simplified: This is called the ` Nexus ' . It designed to prevent swamping of the senate 's power in the case of a joint sitting ( see Section 57 below ) .