Complex sentence: Repair work was carried out on the roof, in 2004, funded by English Heritage; and an electrical fire in January 2006, caused minor damage to the church--but the organ still needs to be checked for smoke damage.
Split into simpler sentences: Repair work was carried out on the roof, in 2004, funded by English Heritage. An electrical fire in January 2006 caused minor damage to the church and the organ still needs checking for smoke damage.