Complex sentence: The relationship cooled in 1874 amid Godwin's preoccupation with his architectural practice and financial difficulties, but even after their 1875 separation Godwin continued to design Terry's costumes as she returned to the stage.
Split into simpler sentences: The relationship cooled in 1874 amid Godwin's preoccupation with his architectural practice and financial difficulties. However, even after their 1875 separation, Godwin continued to design Terry's costumes when she returned to the stage.