In helping myself, and at at the same time keeping an eye on my old mistress, I accidentally let the pitcher fall upon the floor, breaking it in pieces, and spilling the contents.
(I; accidentally let; the pitcher fall upon the floor; L:at at the same time) Context(I accidentally let,List([78, 96))):(the pitcher; fall; upon the floor)
I accidentally let,List([78, 96))
I the pitcher
accidentally let fall
the pitcher fall upon the floor L:at at the same time
upon the floor