Simplify the following text for a Grade 15 native English-speaking person.
Original: Valley refers to the Santa Clara Valley , located at the southern end of San Francisco Bay , while Silicon refers to the high concentration of companies involved in the semiconductor ( silicon is used to create most semiconductors commercially ) and computer industries that were concentrated in the area .
Simplified: Valley refers to the Santa Clara Valley , located at the southern end of San Francisco Bay , while Silicon refers to the high concentration of semiconductor and computer-related industries in the area .