Complex sentence: Stanley claimed that SMU athletic officials paid him $25,000 to sign with SMU in 1983 and continued to pay him monthly while he played for the Mustangs; moreover, the payments had continued after SMU had been given its latest probation.
Split into simpler sentences: Stanley claimed that SMU athletic officials paid him $25,000 to sign with SMU in 1983 and continued to pay him monthly while he played for the Mustangs. More seriously, the payments had continued after SMU had been slapped with its latest probation.