You're talking about
http://en.wikipedia.org/wiki/Wolof_language#Example_phrases, right?
As for how to divide the words, that Wikipedia article has the following:
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Gambian Wolof has an <a> after word-ending doubled (i.e. geminated) consonants
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The first syllable of words is stressed; long vowels are pronounced with more time, but are not automatically stressed, as they are in English.
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Pronoun conjugation instead of verbal conjugation. In Wolof, verbs are unchangeable words which cannot be conjugated. To express different tenses or aspects of an action, the personal pronouns are conjugated - not the verbs. Therefore, the term temporal pronoun has become established for this part of speech.
In "Na nga def", "na" is glossed as "how", "nga" is glossed as "you-perfective", and "def" is glossed as "do". Don't know if that helps, really.