Complex sentence: A dedicated infra-red search and track (IRST) system was downgraded from multi-color to single color and then deleted; the side-looking radars were also deleted, but space and cooling provisions were retained to allow for their future addition.
Split into simpler sentences: A dedicated infra-red search and track (IRST) system was downgraded from multi-color to single color and then deleted, and the side-looking radars were deleted as well. However, space and cooling provisions for the side-looking radars and IRST were retained to allow for their future addition.