Those in Egypt, Libya, Iraq, and Yemen were eventually overthrown by secular nationalist revolutionaries.
( ( Those ( in ( Egypt ( , ( Libya ( , ( Iraq ( , ( and Yemen ) ) ) ) ) ) ) ) ) ( ( ( were eventually ) ( overthrown ( by ( secular ( nationalist revolutionaries ) ) ) ) ) . ) )
(ROOT (S (NP (NP (DT Those)) (PP (IN in) (NP (NNP Egypt) (, ,) (NNS Libya) (, ,) (NNP Iraq) (, ,) (CC and) (NNP Yemen)))) (VP (VBD were) (ADVP (RB eventually)) (VP (VBN overthrown) (PP (IN by) (NP (JJ secular) (JJ nationalist) (NNS revolutionaries))))) (. .)))
The revolutionaries have failed to overthrow it in Yemen.
( ( The revolutionaries ) ( ( have ( failed ( to ( ( overthrow it ) ( in Yemen ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS revolutionaries)) (VP (VBP have) (VP (VBN failed) (S (VP (TO to) (VP (VB overthrow) (NP (PRP it)) (PP (IN in) (NP (NNP Yemen)))))))) (. .)))