Complex sentence: When one life is lost, the game is over and the player must start over; however, if the player holds left on the control pad while pressing the Start button at the title screen, he or she can start where they left off.
Split into simpler sentences: When one life is lost, the game is over and the player must start over. However, if the player holds left on the control pad while pressing the Start button at the title screen, he or she can start where they left off.