Complex sentence: This type of tool is very important for distributed software development where many programmers are collaborating to test and build a single large codebase, it's heavily used, for example, by the maintainers of the Linux kernel.
Split into simpler sentences: This type of tool is very important for distributed software development where many programmers are collaborating to test and build a single large codebase. It's heavily used, for example, by the maintainers of the Linux kernel.