The controller understood, but chose to  Calling Cleveland Center, you're unreadable.
( ( ( The controller ) ( ( ( understood , ) but ) ( chose ( to ( Calling ( Cleveland Center ) ) ) ) ) ) ( , ( you ( ( 're unreadable ) . ) ) ) )
(ROOT (S (S (NP (DT The) (NN controller)) (VP (VP (VBD understood)) (, ,) (CC but) (VP (VBD chose) (PP (TO to) (NP (NNP Calling) (NNP Cleveland) (NNP Center)))))) (, ,) (NP (PRP you)) (VP (VBP 're) (ADJP (JJ unreadable))) (. .)))
The controller decided to not act at all and didn't understood the issue.
( ( The controller ) ( ( ( ( decided ( ( to not ) ( act ( at all ) ) ) ) and ) ( ( did n't ) ( understood ( the issue ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN controller)) (VP (VP (VBD decided) (S (VP (TO to) (RB not) (VP (VB act) (ADVP (IN at) (DT all)))))) (CC and) (VP (VBD did) (RB n't) (VP (VB understood) (NP (DT the) (NN issue))))) (. .)))