Complex sentence: Howard Solomon not only had The Au Go Go Singers, but had also booked comedians such as George Carlin and Lenny Bruce, who had regular stints at Cafe Au Go Go that would last either from one or two days to three weeks.
Split into simpler sentences: Howard Solomon not only had The Au Go Go Singers, but had also booked comedians such as George Carlin and Lenny Bruce. Who had regular stints at Cafe Au Go Go that would last either from one or two days to three weeks.