Complex sentence: Ryan also suffered from various mental illnesses such a Bipolar, Adult ADHD, Depression, Impulse Control Disorder and Anxiety; consistent with many athletes who also suffer from CTE once their playing careers are finished.
Split into simpler sentences: Ryan also suffered from various mental illnesses such a Bipolar, Adult ADHD, Depression, Impulse Control Disorder and Anxiety. Additional mental illnesses are consistent with many athletes who also suffer from CTE once their playing careers are finished.