Complex sentence: Then a special state deputy, in charge of investigating gambling scandals, comes to see Nick and tells him that the jockey could have been silenced by a gambling syndicate, and he asks for Nick's help.
Split into simpler sentences: Then a special state deputy, in charge of investigating gambling scandals, comes to see Nick. He tells Nick that the jockey could have been silenced by a gambling syndicate, and he asks for Nick's help.