The dog's stomach is a sac-like structure designed to store large volumes of food and begin the digestive process.
(The dog's stomach; is; a sac-like structure designed to store large volumes of food and begin the digestive process) (a sac-like structure; designed; to store large volumes of food and begin the digestive process)
The dog's stomach a sac-like structure
is designed
a sac-like structure designed to store large volumes of food and begin the digestive process
to store large volumes of food and begin the digestive process