Complex sentence: Opponents argue that photo ID requirements disproportionately affect minority, handicapped and elderly voters who do not normally maintain driver's licenses, and therefore that requiring such groups to obtain and keep track of photo IDs that are otherwise unneeded is a suppression tactic aimed at those groups.
Split into simpler sentences: Opponents argue that photo ID requirements disproportionately affect minority, handicapped and elderly voters who do not normally maintain driver's licenses. Requiring such groups to obtain and keep track of photo IDs that are otherwise unneeded is considered a suppression tactic aimed at those groups.