Complex sentence: While returning to stand court-martial for their actions in rescuing Spock, Kirk and crew learn that Earth is under the siege of a giant probe transmitting a destructive signal, intended for the long-extinct species of humpback whales.
Split into simpler sentences: While returning to stand court-martial for their actions in rescuing Spock, Kirk and crew learn that Earth is under siege by a giant probe that is transmitting a destructive signal. The signal is intended for the long-extinct species of humpback whales.