英语翻译

英语翻译
The amount of this guarantee shall reduced by the value of supplies ,including plant,documentation ans services,supplied by the Principal under the contract ,as evidenced in writing to us by the principal.This guarantee shall be further automatically reduced by any amount paid hereunder是什么意思?
The amount of this guarantee shall be reduced by the value of supplies including plant,documentation ans services,supplied by the Principal under the contract ,as evidenced in writing to us by the principal.This guarantee shall be further automatically reduced by any amount paid hereunder是什么意思？