Complex sentence: Having taken over Spider-Man's body, Otto Octavius gains possession of all of Spider-Man's powers, abilities, memories, and equipment, although he loses access to Spider-Man's memories after apparently removing his foe from their shared mind.
Split into simpler sentences: Having taken over Spider-Man's body, Otto Octavius gains possession of all of Spider-Man's powers, abilities, memories, and equipment. But he loses access to Spider-Man's memories after apparently removing his foe from their shared mind.