Complex sentence: In addition to upstream elements, there is an upstream TATGAAA sequence (similar to TATA box sequence) at positions -28 to -22 which, when deleted, compromises transcription, revealing this TATA-like sequence as another critical player in the synthesis of BC200 RNA.
Split into simpler sentences: In addition to upstream elements, there is an upstream TATGAAA sequence (similar to TATA box sequence) at positions -28 to -22 which, when deleted, compromised transcription. This revealed this TATA-like sequence as another critical player in the synthesis of BC200 RNA.