Complex sentence: By 13 June 2005, the letter had received over 540,000 signatures from citizens, and more congressmen had signed on, bringing the total to 94--three days later, over 100 congressmen had signed the letter, including then-Minority Leader Nancy Pelosi.
Split into simpler sentences: By 13 June 2005, the letter had received over 540,000 signatures from citizens, and more congressmen had signed on, bringing the total to 94. As of 16 June 2005, over 100 congressmen had signed the letter, including then-Minority Leader Nancy Pelosi.