Complex sentence: It was berthed to the station later that day, using the robotic arm, and will be staying for about a week: enough time for the astronauts to unload cargo, and then load it with Earth-bound cargo.
Split into simpler sentences: It was berthed to the station later that day, using the robotic arm. It will be staying for about a week: enough time for the astronauts to unload cargo, and then load it with Earth-bound cargo.