'change largely' is correct and can be used in written English.
For example, "The company has seen a large change largely due to increased competition in the market."
He credits the change largely to Mass.
Is professional career change largely an American phenomenon? A.
Fortunately, all that is beginning to change, largely because of pressure from Washington.
This change largely stems from the actions of the established developed nations.
Consequently the physical behavior of the hydraulic system may change largely reducing its efficiency.
Theories surrounding her image change largely rumoured that she had suffered from an eating disorder.
Times have changed, largely because incomes have risen -- in a few cases well into six figures.
That has all changed, largely because of the war in Iraq.
These subtle changes largely result from the constant monitoring and measured response of the endocrine system.
(4) The combined effects of sectoral energy intensity and structure changes largely offset carbon emissions.
But all that has changed, largely because of Pratt and the Navy Yard.
