Complex sentence: To provide redundancy, a Space Fountain could be built with more than one projectile loop and power supply; in the event of projectile loops failing, the remaining loops would be capable of supporting the structure until the others were repaired.
Split into simpler sentences: To provide redundancy, a Space Fountain could be built with more than one projectile loop and power supply. In the event of projectile loops failing, the remaining loops would be capable of supporting the structure until the others were repaired.