Dr Casswel refused to interfere with the old man's plans because he didn't want to spoil all the good work they had done.
alternative: Did Dr Casswel or Dr Jakson refuse to interfere with the old mans plans?
special: What did Mr Casswel deside to do with the old man's plans?
Who refused to intefere with the old man's plans?
Did Dr Casswel refuse to interfere with the old man's plans because he didn't want to spoil all the good work they had done?
Dr casswel refused to interfeer with the old man's plansbecause he didn't want to spoil all the good work they had done, didn't he?