node {
    //out of the stage
    sh ('sleep 10')
  stage('S1') {  
    // prepare the parallel jobs
    sh ('sleep 20')
    
    // run them
    parallel 'S1.1.1': { sh('sleep 10') }, 'S1.1.2': { sh('sleep 10') }
    
    // another one
    sh ('sleep 10')
  }

    // cleanup
    sh ('sleep 10')
}