The car which crashed against the mail-box belonged to James Clark, 68, an acquaintance of James Jones' family.
The vehicle that tore up James's mail box was an acquaintance of his.
The vehicle crashed into James Clark's mailbox.  It wasn't his friend, it was James Jones's friend.  Maybe the use of the first name and possession of the mailbox threw it off.
( z1 vehicle :ARG0-of ( z2 tear-up :ARG1 ( z3 box :mod ( z4 mail ) :poss ( z5 person :name ( z6 name :op "James" ) ) ) ) :ARG2-of ( z7 acquaint :ARG1 z5 ) )