When the verb phrases have different doers, the second doer will be marked by a causative marker 給 (gˇei/ to give) or 讓 (r`ang/ to let). The theme shared must be omitted in the 2nd verb phrase.
我買本書給他看書 (w˘o m˘ai bˇen sh¯u gˇei t¯a k`an (sh¯u)/ I bought a book for him to read.)
我買本書讓他送人書 (w˘o m˘ai bˇen sh¯u r`ang t¯a s`ong r´en (sh¯u)/ I bought a book for him to give someone.)
Reference: Chinese: a linguistic introduction by Chao Fen Sun