Complex sentence: However, Vin Diesel has revealed he took a job offer to start starring in a Marvel film, with most speculation pointing to "Avengers 2" or "Guardians of the Galaxy".
Split into simpler sentences: However, Vin Diesel has revealed he was offered a role in a Marvel movie, which he accepted. Most speculation for the film he will appear in points to "Avengers 2" or "Guardians of the Galaxy".