Simplify the following text for a Grade 13 native English-speaking person.
Original: In those cases , there was an abrupt cutoff of energetic electrons as Cassini crossed into the moons ' plasma shadows ( the regions where the moons themselves blocked the magnetospheric plasma from reaching Cassini ) .
Simplified: In those cases , there was a cutoff of energetic electrons as Cassini crossed into the moons ' plasma shadows ( the regions where the moons themselves blocked the magnetospheric plasma from reaching Cassini ) .