detach vs split up

detach

verb
  • To take apart from; to take off. 

  • To separate for a special object or use. 

  • To come off something. 

split up

verb
  • separate, disassociate, cause to come apart. 

  • Cease to be together, break apart from the group. 

adj
  • Divided or separated. 

How often have the words detach and split up occurred in a corpus of books? (source: Google Ngram Viewer )