Complex sentence: Joseph Barbera teamed with the City of Los Angeles Earthquake Preparedness Program and Michael D. Antonovich for a new project called "Shakey Quakey Schoolhouse" with Yogi as spokesbear while H-B characters were involved in other programs with UNICEF, DARE and March of Dimes.
Split into simpler sentences: Joseph Barbera teamed with the City of Los Angeles Earthquake Preparedness Program and Michael D. Antonovich for a new project called "Shakey Quakey Schoolhouse" with Yogi as spokesbear. The H-B characters were involved in other programs with UNICEF, DARE and March of Dimes.