Complex sentence: Later that day PAGASA issued its first advisory on Matmo and assigned the local name of "Dindo" and then the JTWC upgraded the system to a tropical storm later that day.
Split into simpler sentences: Later that day the Philippine Atmospheric, Geophysical and Astronomical Services Administration issued their first advisory on Matmo and assigned the local name "Dindo". The JTWC upgraded the system to a tropical storm later that day.