(S (S (BASENP (DT The) (NN tool)) (VP (VBZ offers) (NP (BASENP (DT a) (NN variety)) (PP (IN of) (NP (NP (NP (BASENP (NNS views)) (PP (IN of) (BASENP (NN document) (NNS histories)))) (PRN (COMMA ,) (PP (VBG including) (NP (BASENP (DT a) (NN view)) (SBAR (WHNP (WDT that)) (S (VP (VP (VBZ gives) (BASENP (DT each) (NN revision))) (BASENP (JJ equal) (NN importance))))))) (COMMA ,))) (CC and) (NP (BASENP (DT a) (NN timeline) (NN view)) (SBAR (WHNP (WDT which)) (S (VP (VP (VP (VBZ displays) (BASENP (DT each) (NN revision))) (ADVP (RB proportionally))) (PP (TO to) (SBAR (WHADVP (WRB how) (RB long)) (S (BASENP (PRP it)) (VP (VBD remained) (ADJP (JJ current))))))))))))))) (PERIOD .))