Atone comes from the Middle English at `at' + on `one.
( Atone ( ( comes ( from ( ( ( the ( Middle English ) ) ( ( ( at ` ) at ) ' ) ) ( + ( ( on ` ) one ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Atone)) (VP (VBZ comes) (PP (IN from) (NP (NP (DT the) (NNP Middle) (NNP English)) (PP (IN at) (`` `) (X (IN at)) ('' ')) (VP (VBN +) (PP (IN on) (`` `) (NP (CD one))))))) (. .)))
Middle English at + on is the origin of Atone.
( ( ( Middle English ) ( at + ) ) ( on ( ( is ( ( the origin ) ( of Atone ) ) ) . ) ) )
(ROOT (S (NP (NP (NNP Middle) (NNP English)) (PP (IN at) (NP (NNP +)))) (ADVP (RB on)) (VP (VBZ is) (NP (NP (DT the) (NN origin)) (PP (IN of) (NP (NNP Atone))))) (. .)))