Complex sentence: With some 65 local chapters, called "courts", during its period of greatest influence, the group was an important Catholic political and fraternal benefit society, which organized Irish Catholics in America against discrimination and gave finaincial aid to impoverished Irish immigrants.
Split into simpler sentences: With some 65 local chapters, called "courts", during its period of greatest influence, the group was an important Catholic political and fraternal benefit society. The early society organized Irish Catholics in America against discrimination, and gave finaincial aid to impoverished Irish immigrants.