sentence: The principal cause of famine in Africa is the ethnic conflicts , which cause wars , the decrease of fertile land and the use of ground only to produce monoculture to export .
modified: The principals cause for famine in Africa are the ethnic conflicts , which causes warms ; the decrease of fertile grounds and the use of ground only to produce monocultures to export .
transformation: MORPH, PREP, VERB:SVA, VERB:SVA, NOUN, PUNCT, NOUN, NOUN:INFL