These are in turn surrounded and supported by holders of school certificates and other qualifications.
( These ( ( are ( in ( turn ( ( ( surrounded and ) supported ) ( by ( holders ( of ( ( ( school certificates ) and ) ( other qualifications ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT These)) (VP (VBP are) (PP (IN in) (NP (NP (NN turn)) (VP (VBN surrounded) (CC and) (VBN supported) (PP (IN by) (NP (NP (NNS holders)) (PP (IN of) (NP (NP (NN school) (NNS certificates)) (CC and) (NP (JJ other) (NNS qualifications)))))))))) (. .)))
People with school certificates surround and support them.
( ( People ( with ( school certificates ) ) ) ( ( ( ( surround and ) support ) them ) . ) )
(ROOT (S (NP (NP (NNS People)) (PP (IN with) (NP (NN school) (NNS certificates)))) (VP (VBP surround) (CC and) (VBP support) (NP (PRP them))) (. .)))