stage('Start') {
 node {
    echo "Start"
 }
}

stage('Middle'){
    parallel(step1: {
        node {
            echo "step 1"
        }
    }, step2: {
        node {
            echo "step 2 start"
            parallel (
                phase1: { echo "Phase 1" },
                phase2: { echo "Phase 2" }
            )
            echo "step 2 end"
        }

    })
}

stage('End') {
 node {
    echo "End"
 }
}