Complex sentence: Woodchuck Hepatitis Virus (WHP) Posttranscriptional Regulatory Element (WPRE) is a DNA sequence that, when transcribed creates a tertiary structure enhancing expression.
Split into simpler sentences: Woodchuck Hepatitis Virus (WHP) Posttranscriptional Regulatory Element (WPRE). A DNA sequence that, when transcribed creates a tertiary structure enhancing expression.