( ( If ( you ( have ( had ( ( lymph nodes ) removed ) ) ) ) ) ( , ( ( your ( immune system ) ) ( ( is compromised ) . ) ) ) )
(ROOT (S (SBAR (IN If) (S (NP (PRP you)) (VP (VBP have) (VP (VBN had) (NP (NP (NN lymph) (NNS nodes)) (VP (VBN removed))))))) (, ,) (NP (PRP$ your) (JJ immune) (NN system)) (VP (VBZ is) (VP (VBN compromised))) (. .)))
If you have had lymph nodes removed, your immune system is compromised.
(ROOT (S (NP (DT Each) (NN lymph) (NN organ)) (VP (VBZ has) (NP (NP (DT a) (JJ different) (NN job)) (PP (IN in) (NP (DT the) (JJ immune) (NN system))))) (. .)))