The enzyme that converts sucrose into two simple sugars, glucose and fructose, is called sucrase (also known as invertase). 

Sucrase is a specific enzyme that catalyzes the hydrolysis (breaking down with water) of sucrose, a disaccharide (a sugar made of two monosaccharides), into its two constituent monosaccharides (simple sugars): glucose and fructose. Invertase is another name for sucrase, and it is important in plants for metabolizing sucrose into simpler sugars for growth and energy.