Complex sentence: Upon the Doom Slayer's return to Mars, Hayden confiscates the Crucible and plans to use it to continue his research; despite all that has happened, Earth is too desperate for energy to give up.
Split into simpler sentences: Upon the Doom Slayer's return to Mars, Hayden confiscates the Crucible, which he plans to use in his research. Despite all that has happened, Earth is too desperate for energy to give up.