Complex sentence: The second, third, and fourth sections of the amendment are seldom litigated; however, the exception for "rebllion and other crimes" in section 2 has been invoced as a constitutional ground for felony disenfranchisement.
Split into simpler sentences: The second, third, and fourth sections of the amendment are seldom litigated. However, Section 2's reference to "rebellion and other crimes" has been invoked as a constitutional ground for felony disenfranchisement.