Between September 2002 and April 2004 , there were 38 formal meetings and 38 preparatory meetings , with the participation of more than 100 TPD/HPFB ( Health Products and Food Branch ) employees , many of whom attended multiple meetings .
The above sentence is very complicated. Please provide me a simplified synonymous version consisting of multiple sentences:
From September 2002 to April 2004 , 38 formal meetings and 38 preparatory meetings were held . Over 100 employees from TPD and the Health Products and Food Branch ( HPFB ) attended , and many attended several of the meetings .