Complex sentence: The human gastrointestinal tract (GI tract or GIT) or alimentary canal is an organ system responsible for transporting and digesting foodstuffs, absorbing nutrients, and expelling waste.
Split into simpler sentences: The human gastrointestinal tract (GI tract or GIT) is the gastrointestinal tract of the human body. It is an organ system responsible for consuming and digesting foodstuffs, absorbing nutrients, and expelling waste.