You will learn later that the person who usually poured out Mrs. Inglethorp's medicine was always extremely careful not to shake the bottle, but to leave the sediment at the bottom of it undisturbed. 
( You ( ( will ( ( learn later ) ( that ( ( ( the person ) ( who ( usually ( ( poured out ) ( ( Mrs. ( Inglethorp 's ) ) medicine ) ) ) ) ) ( ( was always ) ( extremely ( careful ( ( ( ( not ( to ( shake ( the bottle ) ) ) ) , ) but ) ( to ( leave ( ( ( the sediment ) ( at ( ( the bottom ) ( of it ) ) ) ) undisturbed ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP You)) (VP (MD will) (VP (VB learn) (ADVP (RB later)) (SBAR (IN that) (S (NP (NP (DT the) (NN person)) (SBAR (WHNP (WP who)) (S (ADVP (RB usually)) (VP (VBD poured) (PRT (RP out)) (NP (NP (NNP Mrs.) (NNP Inglethorp) (POS 's)) (NN medicine)))))) (VP (VBD was) (ADVP (RB always)) (ADJP (RB extremely) (JJ careful) (S (VP (VP (RB not) (TO to) (VP (VB shake) (NP (DT the) (NN bottle)))) (, ,) (CC but) (VP (TO to) (VP (VB leave) (S (NP (NP (DT the) (NN sediment)) (PP (IN at) (NP (NP (DT the) (NN bottom)) (PP (IN of) (NP (PRP it)))))) (ADJP (JJ undisturbed))))))))))))) (. .)))
The person who poured Mrs. Inglethorp's medicine never shook the bottle so as to leave the sediment untouched. 
( ( ( The person ) ( who ( poured ( ( ( Mrs. ( Inglethorp 's ) ) medicine ) ( never ( ( shook ( the bottle ) ) ( so ( as ( to ( leave ( the sediment ) ) ) ) ) ) ) ) ) ) ) ( untouched . ) )
(ROOT (S (NP (NP (DT The) (NN person)) (SBAR (WHNP (WP who)) (S (VP (VBD poured) (SBAR (S (NP (NP (NNP Mrs.) (NNP Inglethorp) (POS 's)) (NN medicine)) (ADVP (RB never)) (VP (VBD shook) (NP (DT the) (NN bottle)) (ADVP (RB so) (RB as) (S (VP (TO to) (VP (VB leave) (NP (DT the) (NN sediment))))))))))))) (VP (VBD untouched)) (. .)))