YOU SAID:
The prepubescant trogladite failed in the execution of his duties
INTO JAPANESE
思春期前のトログラダイトは彼の任務の遂行に失敗した
BACK INTO ENGLISH
Pre-pubertal trogradite failed to carry out his mission
INTO JAPANESE
思春期前のトログラダイトは彼の使命を遂行できませんでした
BACK INTO ENGLISH
Pre-pubertal trogradite failed to carry out his mission
That didn't even make that much sense in English.