Complex sentence: At the unveiling firefighters solemnly formed a guard of honour at the ceremony, which was attended by family, politicians including Harriet Harman and the Mayor of Southwark, and assorted dignitaries, including the Acting High Commissioner of Trinidad and Tobago.
Split into simpler sentences: At the unveiling firefighters solemnly formed a guard of honour at the ceremony. The ceremony was attended by family, politicians including Harriet Harman and the Mayor of Southwark, and assorted dignitaries, including the Acting High Commissioner of Trinidad and Tobago.