( Typically ( , ( ( a host ) ( ( is ( ( infected ( via ( an ( active invasion ) ) ) ) ( by ( ( ( ( the parasites ) ( -LRB- ( ( similar ( to entosis ) ) -RRB- ) ) ) , ) ( which ( divide ( to ( produce ( sporozoites ( that ( enter ( its cells ) ) ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Typically)) (, ,) (NP (DT a) (NN host)) (VP (VBZ is) (VP (VBN infected) (PP (IN via) (NP (DT an) (JJ active) (NN invasion))) (PP (IN by) (NP (NP (NP (DT the) (NNS parasites)) (PRN (-LRB- -LRB-) (ADJP (JJ similar) (PP (TO to) (NP (NNS entosis)))) (-RRB- -RRB-))) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBP divide) (S (VP (TO to) (VP (VB produce) (NP (NP (NNS sporozoites)) (SBAR (WHNP (WDT that)) (S (VP (VBP enter) (NP (PRP$ its) (NNS cells)))))))))))))))) (. .)))
Typically, a host is infected via an active invasion by the parasites (similar to entosis), which divide to produce sporozoites that enter its cells.
(ROOT (S (NP (NNS Sporozoites)) (VP (VBP are) (NP (NP (DT the) (NNS cells)) (VP (VBN caused) (SBAR (IN that) (S (NP (NNS parasites)) (VP (VBD spread) (PP (IN through) (NP (PRP$ their) (NN host))))))))) (. .)))