As part of their grand scheme, they sent out cube-shaped probes that could effect a mind-swap with any intelligent creature who found one, whereby Yekubian agents could infiltrate the finder's world.
They sent out cube-shaped probes. This was as part of their grand scheme. These shaped probes could effect a mind-swap with any intelligent creature. This intelligent creature found one. Yekubian agents could infiltrate the finder's world.