"The human needs other people."
Translation:Der Mensch braucht andere Menschen.
What was the sentence that you wrote?
There are accepted alternatives that include Leute (even though I think that Menschen is the most appropriate word here).
When do you use Mensch and when do you use Leute for people? Or are they interchangeable?
There is no definite article before it, so it needs strong inflection, not weak inflection.
The strong ending for plural accusative is -e: andere Menschen
"the other people" (with definite article) would be die anderen Menschen, with the weak ending for plural accusative -en after the definite article.
"the human" is the subject here, so it has to be in the nominative case -- der Mensch.
Menschen is the form in the other cases of the singular, and in all cases of the plural.