Complex sentence: Later flashback scenes reveal that Kaine worked as a bounty hunter for a time, being briefly dispatched to eliminate Kraven the Hunter, also experiencing a'vision' via his enhanced spider-sense that Kraven would kill him in the future.
Split into simpler sentences: Later flashback scenes reveal that Kaine worked as a bounty hunter for a time, being briefly dispatched to eliminate Kraven the Hunter. Kaine also experienced a'vision' via his enhanced spider-sense that Kraven would kill him in the future.