Complex sentence: Across the "Naruto" world Jiraiya is known as the as the result of training under the Great Toad Sage to obtain Senjutsu, enabling him summon toads to his side as allies during battle.
Split into simpler sentences: Across the "Naruto" world Jiraiya is known as the. Having been trained by toads to utilize their secret arts, Jiraiya can summon them to his side as allies during battle.