How was the English Civil War ultimately resolved?

The Civil War ended because parliament won by Oliver Cromwells new model army.

The Civil War ended because Charles I tried to join the Scots army and defeat the Roundheads but the Scots give him back to the Roundheads. But Oliver Cromwell was boring so the Scots tried to get Charles I back to over power Oliver Cromwell. So another battle happens and Cromwell wins and Charles I head get chopped off.