Many fruits have been made sweeter and delicious so I highly recommend them!
「多くの果物が甘く改良されて美味しいのでメチャお勧め!」= "Many fruits have been made sweeter and delicious so I highly recommend them!"
「甘く改良されて」= "To be made sweeter"
「メチャお勧め!」= "to highly recommend!"
ご参考になれば幸いです。