He knew the files could be of help to whoever took over the job.请问英语高手们,这句话的主谓宾宾补都是什么,还有whoever这里有没有引导从句,引导的是什么从句

He knew the files could be of help to whoever took over the job.
请问英语高手们,这句话的主谓宾宾补都是什么,还有whoever这里有没有引导从句,引导的是什么从句

这是一个复合句,He knew是主谓,后面the files could be of help to whoever took over the job.是宾语从句（省略了that）.
这个宾语从句里面又套有一个宾语从句whoever took over the job