这句话的意思是说,我有时会在上学的路上给顾客打电话.phone calls做make的宾语,to clients做宾补
转换为被动语态有两种方式
第一种 phone calls 做主语:
Phone calls to clinets are sometimes made by me on the way to school.
第二种 clinets做主语
Clients are sometimes made phone calls by me on the way to school.