begins to seem as long as the two year affair which is its subject 
(ROOT (VP (VBZ begins) (S (VP (TO to) (VP (VB seem) (S (ADJP (ADJP (RB as) (RB long)) (PP (IN as) (NP (NP (DT the) (NML (CD two) (NN year)) (NN affair)) (SBAR (WHNP (WDT which)) (S (VP (VBZ is) (NP (PRP$ its) (NN subject))))))))))))))
(ROOT (VP (VBZ ) (S (VP (TO ) (VP (VB ) (S (ADJP (ADJP (RB ) (RB )) (PP (IN ) (NP (NP (DT ) (NML (CD ) (NN )) (NN )) (SBAR (WHNP (WDT )) (S (VP (VBZ ) (NP (PRP$ ) (NN ))))))))))))))