おもろい例文みつけた　洋画は英語字幕だと簡単なんだがリスニングはなれないど厳しい部分があるわ
Do you meant to say that that thing that killed the unicorn…that was drinking its blood, that was Voldemort?
that　接続詞
that thing　あいつ
that （killed）　関係代名詞　主格
....that 関係代名詞　主格
that (was)　　 that thingと同格
こんな感じですかね...