Complex sentence: The second issue exposed the tension between the Eleventh Amendment, which prohibits federal courts from hearing suits by citizens against their states, and the Fourteenth Amendment, which prohibits the states from violating the Constitutional rights of their citizens.
Split into simpler sentences: The second issue exposed the tension between the Eleventh Amendment and the Fourteenth Amendment. Conversely, the Fourteenth Amendment prohibits the states from violating the Constitutional rights of their citizens.