LACK OF GOOD INTRAFAC COORD LED TO A RWY INCURSION BY ACFT X AS ACFT Y WAS TAKING OFF.

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A MOONEY WAS CLRED FOR TKOF FROM RWY 14L. A CARAVAN WAS CLRED TO CROSS RWYS 14R&L MOMENTS AFTER LNDG RWY 18 (RWYS 14R AND 18 INTERSECT). IT APPEARED THAT THE CARAVAN WAS CLR OF RWY 14L PRIOR TO THE MOONEY TAKING THE RWY FOR DEP. THE GND CTLR BROUGHT IT TO MY ATTN THAT THE CARAVAN WAS STILL XING RWY 14L WITH THE MOONEY DEPARTING. TOO LATE FOR CORRECTIVE ACTION TO BE SOUGHT. CONTRIBUTING FACTORS: 1) TFC WAS COMPLEX AT THE TIME WITH ALL RWYS BEING UTILIZED FOR ARRS AND DEPS; 2) NOT A STANDARD TAXIING RTE FOR THE CARAVAN TO TAKE TO GET TO HIS COMPANY RAMP; 3) WITH IT BEING DUSK AT THE TIME; IT WAS DIFFICULT TO DISTINGUISH THE POS OF THE CARAVAN WITH THE BLENDING OF THE ARPT LIGHTING; AND 4) SCANNING WAS ACCOMPLISHED PRIOR TO CLRING THE MOONEY FOR TKOF. CORRECTIVE ACTIONS: THE AIR TFC MGR IS IN THE PROCESS OF PUTTING OUT 'INFORMATIONAL ITEMS' PERTAINING TO THIS INCIDENT. A HEADS UP TO THE CTLR WORK FORCE TO WATCH OUT FOR THE LESS OBVIOUS. I HAVE INITIATED MY OWN REMEDIAL TRAINING PROGRAM TO REMEDY THIS SIT. I HAVE REVIEWED NUMEROUS VIDEOS PERTAINING TO CTLR SCANNING; CTLR AWARENESS AND RWY INCURSIONS. I HAVE ALSO REVIEWED FAA DIRECTIVES AND TRAINING MANUALS. THE INVESTIGATION IS STILL PENDING.