Now, a bird's stomach has two parts: The first part is the glandular stomach or proventriculus, which produces enzymes that begin 
(the glandular stomach or proventriculus; produces; enzymes that begin) (enzymes; begin; ) (The first part; is; the glandular stomach or proventriculus, which produces enzymes) Context(The first part is,List([37, 54))):(a bird's stomach; has; two parts; T:Now)
The first part is,List([37, 54))
the glandular stomach or proventriculus enzymes The first part a bird's stomach
produces begin is has
enzymes that begin
the glandular stomach or proventriculus, which produces enzymes
two parts T:Now