YOU SAID:

I spent a lot of money on my brand new guitar I spent a lot of money on my new gittar

INTO JAPANESE

新品のギターに多くのお金を費やし、新品のギターに多くのお金を費やしました

BACK INTO ENGLISH

I spent a lot of money on a new guitar and a lot of money on a new one

INTO JAPANESE

新しいギターに多額のお金を費やし、新しいギターに多額のお金を費やした

BACK INTO ENGLISH

I spent a lot of money on a new guitar and a lot of money on a new one