At the end of 1979, the Soviet government sent in military units to ensure that the country would remain securely under Moscow's influence.
( ( At ( ( the end ) ( of 1979 ) ) ) ( , ( ( the ( Soviet government ) ) ( ( ( sent ( in ( military units ) ) ) ( to ( ensure ( that ( ( the country ) ( would ( ( remain securely ) ( under ( ( Moscow 's ) influence ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN At) (NP (NP (DT the) (NN end)) (PP (IN of) (NP (CD 1979))))) (, ,) (NP (DT the) (JJ Soviet) (NN government)) (VP (VBD sent) (PP (IN in) (NP (JJ military) (NNS units))) (S (VP (TO to) (VP (VB ensure) (SBAR (IN that) (S (NP (DT the) (NN country)) (VP (MD would) (VP (VB remain) (ADVP (RB securely)) (PP (IN under) (NP (NP (NNP Moscow) (POS 's)) (NN influence))))))))))) (. .)))
The Soviet Union sent in their military to make sure Moscow influenced the country.  
( ( The ( Soviet Union ) ) ( ( sent ( in ( their ( military ( to ( make ( sure ( Moscow ( influenced ( the country ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNP Soviet) (NNP Union)) (VP (VBD sent) (PP (IN in) (NP (PRP$ their) (NN military) (S (VP (TO to) (VP (VB make) (ADJP (JJ sure) (SBAR (S (NP (NNP Moscow)) (VP (VBD influenced) (NP (DT the) (NN country)))))))))))) (. .)))