Simplify the following text for a Grade 13 native English-speaking person.
Original: Bit-level parallelism is a form of parallel computing based on increasing processor word size , depending on very-large-scale integration ( VLSI ) technology .
Simplified: Bit-level parallelism is a form of parallel computing based on increasing processor word size . From the advent of very-large-scale integration ( VLSI ) computer chip fabrication technology in the 1970s until about 1986 , advancements in computer architecture were done by increasing bit-level parallelism