Complex sentence: Since the show was announced by Shed Productions in early 2004, it was originally intended to be aired in 2005, but more than five years on, "Bombshell" has still not been shown in the UK.
Split into simpler sentences: Since the show was announced by Shed Productions in early 2004, it was originally thought to have aired in 2005. Now, nearly four years on, Bombshell has still not been shown in the UK.