Why did the founding fathers separate the powers of government between the three branches?

They wanted to have a government that did not just have one person to have so much control and power

sir thomas more, venerated in the catholic church as saint thomas more, was an english lawyer, social philosopher, author, statesman, and noted renaissance humanist. he was also a councillor to henry viii, and lord high chancellor of england from october 1529 to 16 may 1532.