Complex sentence: For instance, while long serving to preserve their religion, the Samaritans' practice of endogamy now threatens this community: refusal to intermarry, in conjunction with their non-acceptance of converts, has led the population of this ethnic group to decrease to fewer than one thousand.
Split into simpler sentences: For instance, while long serving to preserve their religion, the Samaritans' practice of endogamy now threatens this community. Refusal to intermarry, in conjunction with their non-acceptance of converts, has led the population of this ethnic group to decrease to fewer than one thousand.