Complex sentence: On January 8,2003, she delivered a letter to Card urging the White House to not invade Iraq, and, claiming she had influence, offered to act as a back channel in negotiations with Iraq.
Split into simpler sentences: On January 8,2003, she delivered a letter to Card urging the White House to not invade Iraq. In her letter she claimed she had influence and offered to act as a back channel in negotiations with Iraq.