Simplify the following text for a Grade 11 native English-speaking person.
Original: He was able to start the devolution process , and worked endlessly on creating the Scotland Act , popularly known as Smith 's `` unfinished business '' .
Simplified: He was able to start the process to split Scotland from the United Kingdom , and worked endlessly on creating the Scotland Act , popularly known as Smith 's `` unfinished business '' .