Complex sentence: The ACLU sued the affluent school for $10 million, even though the Blackbears weren't sure they deserved that much based on what Brandi had suffered... but the ACLU argued that the school wouldn't take any lesser claim seriously.
Split into simpler sentences: The ACLU sued the affluent school for $10 million, even though the Blackbears were not sure they deserved that much based on what Brandi had suffered. Still, the ACLU argued that the school wouldn't take any lesser claim seriously.