Complex sentence: The symbolic cornerstone of One World Trade Center was laid in a ceremony on July 4,2004 (with an inscription supposedly by Arthur J. Finkelstein), but further construction work was stalled until 2006 due to disputes over money, security and design.
Split into simpler sentences: The symbolic cornerstone of One World Trade Center was laid in a ceremony on July 4,2004. However, construction was delayed until 2006 due to disputes over money, security and design.