YOU SAID:
I am going to become the worlds most greatest swordsman
INTO JAPANESE
世界一の剣豪になるんだよ
BACK INTO ENGLISH
I'll become the world's best swordsman
INTO JAPANESE
世界一の剣豪になるよ
BACK INTO ENGLISH
I will become the best swordsman in the world
INTO JAPANESE
世界一の剣豪になるよ
BACK INTO ENGLISH
I will become the best swordsman in the world
That didn't even make that much sense in English.