YOU SAID:
He was disappointed when he found the beach to be so sandy and the sun so sunny
INTO JAPANESE
ビーチがとても砂浜で太陽がとても晴れているのを見つけたとき、彼はがっかりしました
BACK INTO ENGLISH
He was disappointed when he found the beach very sandy and the sun very sunny
INTO JAPANESE
ビーチがとても砂浜で、太陽がとても晴れているのを見つけたとき、彼はがっかりしました
BACK INTO ENGLISH
He was disappointed when he found the beach very sandy and the sun very sunny
That didn't even make that much sense in English.