John-wa [[otooto-ni nanika-o okutte-ita hito]-o syootai-sita rasii-ga, boku-wa [nani(*-o) ka] siranai.
John-TOP brother-DAT something-ACC sent person-ACC invited seems but I-TOP what-ACC Q not-know
It seems that John invited a person who had sent something to his brother, but I don't know what.