"simple extension" is a correct phrase that can be used in written English.
For example, "We are hoping for a simple extension of the deadline."
Syntactically, Deco's query language is a simple extension to SQL.
Throughout most of history, we viewed the future as a simple extension of the past.
In a broad sense it can be regarded as simple extension of standard scientific methodology.
One is congressional budgetary rules, which allow for simple extension of the middle-income tax cuts.
Daggi Kröschel-Willis Not surprisingly, there is a simple extension that you can download to add the outbox facility.
The world of digital cellular phones, however, is rapidly becoming a simple extension of the world of personal computing.
The American Farm Bureau, a big farmers' lobby group, is pushing for a simple extension of today's subsidies.
Simple extension of the formalism to include the effect of a perforated facing is also provided.
The vapor-phase solution is a simple extension of classical droplet theory.
Nevertheless a simple extension to piecewise linear basis functions enables to obtain the correct solution.
Projectors with three imaging elements and three filters can be characterized by a simple extension to the monitor calibration model.
