Complex sentence: The salivary glands in mammals are exocrine glands, glands with ducts, that produce saliva, which is formed of several things including amylase, a digestive enzyme that breaks down starch into maltose and glucose.
Split into simpler sentences: The salivary glands in mammals are exocrine glands, glands with ducts, that produce saliva. They also secrete amylase, a digestive enzyme that breaks down starch into maltose and glucose.