( ( Professionals ( known ( as ( genetic counselors ) ) ) ) ( ( can ( help ( them ( understand ( ( the risks ) ( of ( ( their children ) ( being affected ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (NNS Professionals)) (VP (VBN known) (PP (IN as) (NP (JJ genetic) (NNS counselors))))) (VP (MD can) (VP (VB help) (S (NP (PRP them)) (VP (VB understand) (NP (NP (DT the) (NNS risks)) (PP (IN of) (NP (NP (PRP$ their) (NNS children)) (VP (VBG being) (VP (VBN affected)))))))))) (. .)))
Professionals known as genetic  counselors can help them understand the risks of their children being affected.
(ROOT (S (NP (NP (NNS Professionals)) (VP (VBN known) (PP (IN as) (NP (JJ genetic) (NNS counselors))))) (VP (MD can) (VP (VB help) (S (NP (PRP them)) (VP (VB understand) (NP (NP (DT the) (NNS risks)) (PP (IN of) (NP (NP (NNS children)) (VP (VBG being) (VP (VBN affected)))))))))) (. .)))