Complex sentence: Aptana Jaxer provides a page-processing environment based on the Mozilla engine, providing a Gecko-based DOM and SpiderMonkey JavaScript engine to enable pages to be rendered and manipulated on the server before being sent to the browser.
Split into simpler sentences: Aptana Jaxer provides a page-processing environment based on the Mozilla engine. This provides a Gecko-based DOM and SpiderMonkey JavaScript engine to enable pages to be rendered and manipulated on the server before being sent to the browser.