Securely attached infants actively seek contact with and are easily consoled by their familiar, responsive caregiver.
( ( ( Securely attached ) infants ) ( actively ( ( ( ( ( seek contact ) with ) and ) ( ( are easily ) ( consoled ( by ( their ( ( familiar ( , responsive ) ) caregiver ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (ADJP (RB Securely) (JJ attached)) (NNS infants)) (ADVP (RB actively)) (VP (VP (VBP seek) (NP (NN contact)) (PP (IN with))) (CC and) (VP (VBP are) (ADVP (RB easily)) (VP (VBN consoled) (PP (IN by) (NP (PRP$ their) (ADJP (JJ familiar) (, ,) (JJ responsive)) (NN caregiver)))))) (. .)))
When an infant is attached to their caregiver they actively seek contact and comfort from them. 
( ( When ( ( an infant ) ( is ( attached ( to ( their caregiver ) ) ) ) ) ) ( they ( actively ( ( ( seek ( ( contact and ) comfort ) ) ( from them ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (DT an) (NN infant)) (VP (VBZ is) (VP (VBN attached) (PP (TO to) (NP (PRP$ their) (NN caregiver))))))) (NP (PRP they)) (ADVP (RB actively)) (VP (VBP seek) (NP (NN contact) (CC and) (NN comfort)) (PP (IN from) (NP (PRP them)))) (. .)))