Complex sentence: Company 21 is a LCFR company simply for operational sake, as the staffing is maintained by FEMA, and to respond to mutual aide calls, the units must be released by FEMA prior to response.
Split into simpler sentences: Company 21 is only considered a LC-CFRS company for operational planning purposes, as the staffing is maintained by FEMA. To respond to mutual aide calls, the units must be released by FEMA prior to response.