Complex sentence: In 1906, all of the academic departments were accredited by the University of California, Berkeley and since then, San Mateo High School has been recognized as a leading institution of learning in the San Mateo community.
Split into simpler sentences: In 1906, all of the academic departments were accredited by the University of California, Berkeley. Since then, San Mateo High School has been recognized as a leading institution of learning in the San Mateo community.