verb

remove material that is considered improper or offensive from (a text or account), especially with the result that the text becomes weaker or less effective.

every edition of his letters and diaries has been bowdlerized

expurgate,censor,blue-pencil,cut,edit,redact,make cuts to,delete parts of,make deletions in,purge,purify,sanitize,make presentable,make acceptable,make palatable,water down,emasculate,clean up