YOU SAID:

The boy is wearing blue socks with his black sneakers

INTO JAPANESE

少年は黒いスニーカーで青い靴下を履いている

BACK INTO ENGLISH

The boy is wearing black sneakers and blue socks.

INTO JAPANESE

少年は黒いスニーカーと青い靴下を履いている。

BACK INTO ENGLISH

The boy is wearing black sneakers and blue socks.