Meaning: This means that when people work together as a team, they are more likely to achieve their goals than when they work alone.
Choice of Words: The word "teamwork" means the combined effort of a group of people working together. "Divides" means to separate or split into parts. "Task" means a piece of work that has to be done. "Multiplies" means to increase in number or amount. "Success" means the achievement of a goal or aim. When you put them together, the sentence means that when people work together as a team, they can complete a task more easily and achieve greater success than they could if they worked alone.