Complex sentence: However, after meeting their creator who is also controlling the military, "Father," the Elrics are ordered to keep working with them; the homunculi threaten to kill their friends from Resembool if they stand against them.
Split into simpler sentences: However, after meeting their creator, "Father," who is also controlling the military, the Elrics are ordered to keep working with them. They accepted it as the homunculi threaten to kill their friends from Resembool if they stand against them.