( ( Observe ( how ( ( the embryos ) ( are ( located ( ( ( on ( ( each side ) ( of ( the uterus ) ) ) ) and ) ( in ( the ( amniotic sacs ) ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Observe) (SBAR (WHADVP (WRB how)) (S (NP (DT the) (NNS embryos)) (VP (VBP are) (VP (VBN located) (PP (PP (IN on) (NP (NP (DT each) (NN side)) (PP (IN of) (NP (DT the) (NN uterus))))) (CC and) (PP (IN in) (NP (DT the) (JJ amniotic) (NNS sacs))))))))) (. .)))
Observe how the embryos are located on each side of the uterus and in the amniotic sacs.
(ROOT (S (NP (NP (DT The) (JJ amniotic) (NN sac)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBD was) (VP (VBG sitting) (PP (IN on) (NP (NP (NN top)) (PP (IN of) (NP (DT the) (JJ flat) (NN embryo))))))))) (, ,)) (VP (VBZ envelops) (NP (DT the) (NN embryo)) (SBAR (IN as) (S (NP (PRP it)) (VP (VBZ folds))))) (. .)))