Traditional relation extraction methods focussing on intra-sentence relation extraction will fail to extract the relation book/author/works written, between the entities (Ayan Rand, The Fountainhead), (Ayn Rand, Atlas Shrugged), (Alisa Zinovyevna Rosenbaum, The Fountainhead), (Alisa Zinovyevna Rosenbaum, Atlas Shrugged) from these two sentences.
in order to extract these relationships, both sentences must be considered collectively.