"刺探赛马情报" can be translated as "spy on horse racing information" or "gather intelligence on horse racing".
Here, "spy on" and "gather intelligence on" both convey the idea of secretly obtaining information, which aligns with the meaning of "刺探" (to spy on or pry into). "Horse racing information" or "horse racing intelligence" clearly refers to the details or data related to horse racing, matching "赛马情报" (horse racing information or intelligence).