RecruitingPhase 2Drug trialPhase II Study of Combined Pirtobrutinib, Venetoclax and Obinutuzumab (PVO) Time-limited Treatment for Patients With Recurrent Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma (CLL/SLL).To learn if the drug combination pirtobrutinib, venetoclax, and obinutuzumab can help to control relapsed CLL/SLL.