In the sentence below:
The North Bridge and South Bridge together form the computer’s chipset**,** secondary only to the processor in determining the performance and capabilities of a PC.
The first part does make sense.
The North Bridge and South Bridge together form the computer’s chipset
But after the "comma",
secondary only to the processor in determining the performance and capabilities of a PC
What is this structure? What is the verb for this? What does "secondary to" mean?
Thank you in advance.