Complex sentence: He is found by Mitsuki, who has followed him, and along with a military escort, takes him to the Earth Defense Force HQ, a paramilitary operation led by this world's Dr. Sanada.
Split into simpler sentences: He is found by Mitsuki, who has followed him. Along with a military escort, she takes him to the Earth Defense Force HQ, a paramilitary operation led by this world's Dr. Sanada.