Complex sentence: As tensions mounted the Bty moved to concentration area "RAY" and with the failure of the Gorbachev peace talks on 22 February, the Battlegroup deployed to its forward staging areas ready for commencement of hostilities.
Split into simpler sentences: As tensions mounted, the Bty moved to concentration area "RAY". With the failure of the Gorbachev peace talks on 22 February, the Battlegroup deployed to its forward staging areas ready for commencement of hostilities.