Why did the framers split the Legislative branch into 2 houses?

"To balance the interests of both the small and large states"

Explanation:

got that from visitthecapitol. gov

To balance the interests of both the small and large states, the Framers of the Constitution divided the power of Congress between the two houses. Every state has an equal voice in the Senate, while representation in the House of Representatives is based on the size of each state's population.