( ( ( Most ( biological entities ) ) ( that ( ( are ( more ( complex ( than ( a virus ) ) ) ) ) ( ( sometimes or ) always ) ) ) ) ( ( carry ( ( additional ( genetic material ) ) ( besides ( that ( which ( resides ( in ( their chromosomes ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NP (JJS Most) (JJ biological) (NNS entities)) (SBAR (WHNP (WDT that)) (S (VP (VBP are) (ADJP (RBR more) (JJ complex) (PP (IN than) (NP (DT a) (NN virus)))) (ADVP (RB sometimes) (CC or) (RB always)))))) (VP (VBP carry) (NP (NP (JJ additional) (JJ genetic) (NN material)) (PP (IN besides) (NP (NP (DT that)) (SBAR (WHNP (WDT which)) (S (VP (VBZ resides) (PP (IN in) (NP (PRP$ their) (NNS chromosomes)))))))))) (. .)))
Most biological entities that are more complex than a virus sometimes or always carry additional genetic material besides that which resides in their chromosomes.
(ROOT (S (NP (NNS Viruses)) (VP (VBP are) (NP (NP (DT the) (ADJP (RBS most) (JJ abundant)) (NN type)) (PP (IN of) (NP (NP (JJ biological) (NN entity)) (PP (IN on) (NP (DT the) (NN earth))))))) (. .)))