(S (S (BASENP (DT The) (NNP AMISOM) (NNS forces)) (VP (VBP are) (VP (VBN mandated) (PP (IN with) (NP (BASENP (DT the) (NN protection)) (PP (IN of) (NP (BASENP (JJ key) (NN city) (NNS sites)) (PP (IN such) (PP (IN as) (NP (DT the) (NP (NP (BASENP (NN airport)) (COMMA ,) (BASENP (NN seaport))) (CONJP (COMMA ,) (CC and)) (BASENP (JJ presidential) (NN palace))))))))))))) (PERIOD .))