When people are late, it makes it hard to keep things working in a rational fashion.
( ( When ( people ( are late ) ) ) ( , ( it ( ( makes ( it ( hard ( to ( keep ( things ( working ( in ( a ( rational fashion ) ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (SBAR (WHADVP (WRB When)) (S (NP (NNS people)) (VP (VBP are) (ADJP (JJ late))))) (, ,) (NP (PRP it)) (VP (VBZ makes) (S (NP (PRP it)) (ADJP (JJ hard) (S (VP (TO to) (VP (VB keep) (NP (NP (NNS things)) (VP (VBG working) (PP (IN in) (NP (DT a) (JJ rational) (NN fashion))))))))))) (. .)))
It doesn't matter at what time do people arrive.
( It ( ( ( does n't ) ( matter ( at ( what ( time ( do ( people arrive ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ does) (RB n't) (VP (VB matter) (PP (IN at) (SBAR (WHNP (WP what)) (S (NP (NN time)) (VP (VBP do) (SBAR (S (NP (NNS people)) (VP (VBP arrive)))))))))) (. .)))