Complex sentence: There have been several attempts to attribute his death to suicide, notably by theatre journal "The Stage", and when interviewed by Humphrey Carpenter in 1995, Douglas Cleverdon's widow Nest told him that she believed it was suicide.
Split into simpler sentences: There have been several attempts to attribute his death to suicide, in particularly by "The Stage" newspaper. When interviewed by Humphrey Carpenter in 1995, Douglas Cleverdon's widow Nest told him that she believed it was suicide.