Once, when cutting through the park, I decided to take a different route.
(I; decided; to take a different route; T:Once; T:when cutting through the park) Context(I decided,List([37, 46))):(I; decided to take; a different route)
I decided,List([37, 46))
I I
decided decided to take
to take a different route T:Once T:when cutting through the park
a different route