Point out the portion having a mistake :
The poors (A) / are always helped (B) / by them (C) / who are kind and generous (D)

The error lies in part A. The adjective 'poor', when preceded by the definite article 'the' (the poor), acts collective-plural to represent all poor people. It is inherently plural in this construction, so adding an 's' to make it "poors" is grammatically incorrect. It must be written as "The poor".