Complex sentence: Section I of the Pocket Guide identifies the very first public fire alarm reporting system in the world, the Boston Fire Alarm Telegraph, which went into service in April 1852, and goes on to highlight key transitions that affected the fire alarm industry.
Split into simpler sentences: Section I of the Pocket Guide identifies the very first public fire alarm reporting system in the world, the Boston Fire Alarm Telegraph, which went into service in April 1852. The Guide goes on to highlight key transitions that affected the fire alarm industry.