What is the benefit of using a multiple-bus architecture compared to a single-bus architecture?

Using a multi-bus architecture will really improve the speed and also increase the performance of your processor in execution of different instructions because using a multi- bus architecture will help in such a way that one device would be connected to one bus or less devices would be connected to one bus rather than in single bus architecture more devices would be attached to single bus.

Multi-bus architecture is efficient, since if only one bus is for everything, only one device can then communicate at a time, since if more than one device were to try and send data on the single bus, transmission would be garbled.