Complex sentence: She also studied at the Musikhochschule in Frankfurt, Germany with Helmut Walcha, although her relationship with Walcha was difficult as he "did not believe that women belonged on the organ bench".
Split into simpler sentences: She also studied at the Musikhochschule in Frankfurt, Germany with Helmut Walcha. She has said her work with him was difficult as he "did not believe that women belonged on the organ bench".