Step-by-step explanation:
Complex carbohydrates like fruits, vegetables, whole grains, beans, peas etc. They contain vitamins, minerals and fibres, that's why they are the source of long lasting energy because they take long time to digest.
Complex carbohydrates are healthier than simple carbohydrates like sugar are present in fruits, table sugar, soft drinks, milk and milk products etc. They digested quickly not the long lasting as complex carbohydrates, they can easily broken down by the body.
Complex are better dietary choice because it contains more nutrients than simple carbs. They are high in fibre and digested slowly, this is the better way for weight control.