Complex sentence: Sharp was active in the field of developing APL interpreters for the IBM PC and other computers-the IBM PC implementation was based on an IBM 370 emulator, written by APL implementor Roger Moore, which subsequently ran the mainframe Sharp APL executable on the PC.
Split into simpler sentences: Sharp was active in the field of developing APL interpreters for the IBM PC and other computers. Their IBM PC implementation was based on a software IBM System/370 emulator, written by Roger Moore, which ran the mainframe Sharp APL executable on the PC.