The phrase "a result of extensive" is correct and usable in written English.
It can be used to indicate that something is caused by or derived from a thorough or comprehensive process or effort.
Example: "The improvements in the project were a result of extensive research and development."
Alternatives: "due to thorough" or "as a consequence of comprehensive".
"The quality and safety of stadia is as a result of extensive and continued investment from the clubs.
But all of that is irrelevant to some food manufacturers, who are switching to sugar as a result of extensive taste testing and consumer surveys.
As a result of extensive mechanical treatment, the Stabilat® produced is of a fluffy appearance with a low density.
This quality has come as a result of extensive testing and never has that been more apparent than with the Unity range.
As a result of extensive research during the past 20 years, habitat requirements for many species of grassland birds during the breeding season are generally well known.
Moreover, these behaviors should emerge automatically from only a few core principles, and not be a result of extensive manual engineering or a mimicking of human patterns.
These films are massively voided as a result of extensive internal delamination, which occurs after the polypyrrole is deposited onto the work electrode.
The selection of the sensitive materials for the array has been accomplished as a result of extensive studies of gas-sensitive properties of SMO.
As a result of extensive research and development, new natural fiber reinforced composite materials are emerging and the database of materials growing exponentially.
The triaxial braids within this study exhibited severe non-linearities in the mechanical response before final failure as a result of extensive matrix cracking.
In this paper we describe the development of four different amorphous silicon based pixn multispectral photodetectors and discuss their optical characteristics as a result of extensive bandgap engineering.
