Complex sentence: Rather than building the entire project all at once, the SCRTD divided the project into "minimum operating segments" (MOS), corridor segments that could be built as distinct project phases that would provide incremental benefit as they opened.
Split into simpler sentences: Rather than building the entire project all at once, the SCRTD divided the project into "minimum operating segments" (MOS). These were corridor segments that could be built as distinct project phases, that would provide incremental benefit as they opened.