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))))))) (. .)))
A friend knows the lift boy here.
( ( A friend ) ( ( ( knows ( the ( lift boy ) ) ) here ) . ) )
(ROOT (S (NP (DT A) (NN friend)) (VP (VBZ knows) (NP (DT the) (NN lift) (NN boy)) (ADVP (RB here))) (. .)))