Most humans struggle when reading garden-path sentences, so I would be quite impressed if an NLP toolkit handled them easily out-of-the-box.

EDIT: On a related note, when I was an undergrad there was a group on campus that was doing research on how humans repair garden-path sentences when their first reading is incorrect. They were measuring ERPs to see if something akin to a backtracking algorithm was used + eye-tracking to see which word/words triggered the repair. I graduated before the work was complete, but I might go digging for it to see if it was ever published.

EDIT 2: Apparently this is better researched than I realized: https://en.wikipedia.org/wiki/P600_(neuroscience)