Poverty unites families rather than destroying them.
Literal
Poverty [topic-は] family [object-を] destroying [rather-than-よりは] rather causes-to-unite.
This sentence uses the literary/archaic causative せしめる (classical させる), giving it a formal, essay-like tone. よりはむしろ means 'rather than.' Modern Japanese would use 団結させる instead of 団結せしめる.