Complex sentence: However, during her concious state, Zhu Ling denied that she had Thallium contact record, which was then verified by Tsinghua University's chemistry depertment.
Split into simpler sentences: However, during her waking up period, Zhu Ling denied that she had Thallium contact history. Her lack of Thallium contact history was then verified by Tsinghua University's chemistry depertment.