TASK DEFINITION: In this task, you are given a sentence in the English language and your task is to convert it into the Japanese language. In translation, keep numbers as it is and make it sentence case (capitalize only the first word of each sentence and noun).
PROBLEM: "And we discovered that insulin and its growth factors, which are necessary for the survival of brain cells, contribute to the progression of Alzheimer's."

SOLUTION: 「また、脳細胞の存続に必要なインシュリンとインシュリンの発達要因がアルツハイマー病を促進していることも発見しました」

PROBLEM: He is also said to have reported the theft on the Scotland Yard online reporting website, but was pessimistic about it being returned.

SOLUTION: 彼は盗難をスコットランドヤード・オンラインレポーティングウェブサイトに報告したそうであるが、戻ってくるとは思っていなかった。

PROBLEM: "Keep his body straight, his arm straight and keep his steps straight". 

SOLUTION:
「体をまっすぐ起こして、腕をまっすぐ伸ばして、ステップをまっすぐに」