Complex sentence: After Tom later informs the Spook of this, John Gregory reveals he had his suspicions all along, and they together conclude Alice used her own blood in the bloodjar, so desperate was she to protect Tom.
Split into simpler sentences: After Tom later informs the Spook of this, John Gregory reveals he had his suspicions all along. Together they conclude that Alice used her own blood in the blood jar, so desperate was she to protect Tom.