In the late 1990s, these extremist groups suffered major defeats by Kurdish forces.
( ( In ( the ( late 1990s ) ) ) ( , ( ( these ( extremist groups ) ) ( ( ( suffered ( major defeats ) ) ( by ( Kurdish forces ) ) ) . ) ) ) )
(ROOT (S (PP (IN In) (NP (DT the) (JJ late) (NNS 1990s))) (, ,) (NP (DT these) (NN extremist) (NNS groups)) (VP (VBD suffered) (NP (JJ major) (NNS defeats)) (PP (IN by) (NP (NNP Kurdish) (NNS forces)))) (. .)))
Kurdish forces suffered devastating losses to these extremist groups.
( ( Kurdish forces ) ( ( ( suffered ( devastating losses ) ) ( to ( these ( extremist groups ) ) ) ) . ) )
(ROOT (S (NP (JJ Kurdish) (NNS forces)) (VP (VBD suffered) (NP (JJ devastating) (NNS losses)) (PP (TO to) (NP (DT these) (NN extremist) (NNS groups)))) (. .)))