Complex sentence: While all episodes were in colour, the pilot survived only in black-and-white, however it was restored into colour using the computer colour restoration technique, and is to be aired on BBC Two on 1 January 2010.
Split into simpler sentences: While all episodes were in colour, the pilot currently survives only in black-and-white. However, it was restored into colour using the computer colour restoration technique, and is to be aired on BBC Two on 1 January 2010.