Tā bǎ chuántǒng jìfǎ jiàjiē dào xiàndài shèjì shàng.
He grafts traditional techniques onto modern design.
Tips
memory
嫁 normally means "to marry (off a daughter)." In 嫁接, think of it as "marrying" one branch onto another stock — a botanical wedding. Used figuratively for splicing ideas or techniques together.