Complex sentence: Rumors have been circling that the Spanos family is ready to fire him as they plan to develop a brand new stadium in San Diego, which throughout the NFL is popularly believed as the smarter choice for the football team.
Split into simpler sentences: Rumors have been circling that the Spanos family is ready to fire him as they plan to develop a brand new San Diego stadium. Which throughout the NFL is popularly believed as the smarter choice for the football team.