Complex sentence: By 1985, the monoamine hypothesis was mostly dismissed until it was revived with the introduction of SSRIs through the successful direct-to-consumer advertising, often revolving around the claim that SSRIs correct a chemical imbalance caused by a lack of serotonin within the brain.
Split into simpler sentences: By 1985, the hypothesis was mostly dismissed until it was revived with the introduction of SSRIs. Successful direct-to-consumer advertising often revolved around the claim that SSRIs correct a chemical imbalance caused by a lack of serotonin within the brain.