YOU SAID:

I find the yellow people no trouble at all

INTO JAPANESE

私は黄色の人々が全く問題がないことを知る

BACK INTO ENGLISH

I know that the yellow people have no problem at all

INTO JAPANESE

私は黄色の人々は全く問題がないことを知っている

BACK INTO ENGLISH

I know that the yellow people have no problem at all