Relativization by postnominal finite clause introduced by a relative pronoun. Both R (as in (11a)) and T (as in (11b)) can undergo relativization. Importantly, (unless a resumptive pronoun is used) retained (second) objects remain unmarked (see (11)), which suggests that not only the underlying first object may be relativized.
Source: König and Heine 2010: (ex.11b)
Source: König and Heine 2010: (ex.11a)