Through a friend who knows the lift boy here.
( ( Through ( ( a friend ) ( who ( ( knows ( the ( lift boy ) ) ) here ) ) ) ) . )
(ROOT (FRAG (PP (IN Through) (NP (NP (DT a) (NN friend)) (SBAR (WHNP (WP who)) (S (VP (VBZ knows) (NP (DT the) (NN lift) (NN boy)) (ADVP (RB here))))))) (. .)))
Through my best friend who knows the lift boy here.
( ( Through ( ( my ( best friend ) ) ( who ( ( knows ( the ( lift boy ) ) ) here ) ) ) ) . )
(ROOT (FRAG (PP (IN Through) (NP (NP (PRP$ my) (JJS best) (NN friend)) (SBAR (WHNP (WP who)) (S (VP (VBZ knows) (NP (DT the) (NN lift) (NN boy)) (ADVP (RB here))))))) (. .)))