After rearranging the words, this is what we have:
We need psychologists and sociologists in our life! We can't say one is more useful than the other.
For this type of question, a few steps may be helpful in the process of answering:
Look for nouns/pronouns and verbs first. This will help you figure out which words may be the subject of the sentence and what action that subject is performing.
Try different possibilities and then try including the prepositions and others words left. If it makes sense, it means you are most likely on the right path.
Pay attention to the punctuation. A question mark indicates an interrogative sentence, which means we need to have an auxiliary verb placed before the subject.
