Complex sentence: Chuck had a telepathic link with Hal, who would lose consciousness and become comatose when the 3-D Man is active; the 3-D Man's consciousness is apparently a synthesis of Chuck and Hal's mind's, with Chuck's usually dominant.
Split into simpler sentences: Chuck had a telepathic link with Hal, who would lose consciousness and become comatose when the 3-D Man is active. The 3-D Man's consciousness is apparently a synthesis of Chuck and Hal's mind's, with Chuck's usually dominant.