divide and conquer

US /dɪˈvaɪd ænd ˈkɑːŋkər/
UK /dɪˈvaɪd ænd ˈkɑːŋkər/
"divide and conquer" picture
1.

a strategy of breaking a large problem or task into smaller, more manageable parts to solve them more easily, or a political strategy of maintaining control over a population by encouraging internal divisions and conflicts

:
To tackle the complex project, we decided to divide and conquer by assigning different teams to specific modules.
The dictator used a divide and conquer strategy to prevent any unified opposition from forming.