This is the best summary I could come up with:

The National Comedy Center, on behalf of his family, said in a statement Wednesday that Smothers died Tuesday at home in Santa Rosa, California, following a cancer battle.

When “The Smothers Brothers Comedy Hour” debuted on CBS in the fall of 1967 it was an immediate hit, to the surprise of many who had assumed the network’s expectations were so low it positioned their show opposite the top-rated “Bonanza.”

But the Smothers Brothers would prove a turning point in television history, with its sharp eye for pop culture trends and young rock stars such as the Who and Buffalo Springfield, and its daring sketches — ridiculing the Establishment, railing against the Vietnam War and portraying members of the era’s hippie counterculture as gentle, fun-loving spirits — found an immediate audience with young baby boomers.

After years of battling with the brothers over the show’s creative content, the network abruptly canceled the program in 1970, accusing the siblings of failing to submit an episode in time for the censors to review.

The family eventually moved to the Los Angeles suburb of Redondo Beach, where Smothers helped his mother take care of his brother and sister while she worked.

They had spent several years on the nightclub and college circuits and doing TV guest appearances, honing an offbeat comedy routine that mixed folk music with a healthy dose of sibling rivalry.

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