Complex sentence: In 2006 there was a mooring damaged over the tunnel, from it the tunnel was also damaged, and at the end of June, 2009 tunnel repair was again required, with the drainage system being replaced.
Split into simpler sentences: In 2006 there was a mooring damaged over the tunnel, from it the tunnel was also damaged. At the end of June 2009 tunnel repair was again required, with the drainage system being replaced.