The author Philip Roth, who died in 2018, was not sure whether he wanted to be the subject of a biography. In the end, he decided that he wanted to be known and understood. His search for a biographer was long and fraught — Mr. Roth parted ways with two, courted one and sued another — before he settled on Blake Bailey, one of the great chroniclers of America’s literary lives. Today on The Sunday Read, the journey of rendering a writer whose life was equal parts discipline and exuberance.