Original: In 1906, at the second International Radiotelegraphic Convention in Berlin, an extensive collection of Service Regulations was developed to supplement the main agreement, which was signed on November 3, 1906, becoming effective on July 1, 1908.
Simplified: This convention developed many Service Regulations to be added to the main agreement, which was signed on November 3, 1906, and became effective on July 1, 1908.