Complex sentence: During Operation HERRICK the reservists were involved in the training the Afghan National Police, following a review of the unit's operational capability they were withdrawn from front line operations and the task handed over to a "regular" infantry unit.
Split into simpler sentences: During Operation Herrick the reservists were involved in the training of the Afghan National Police. Following a review of the unit's operational capability they were withdrawn from front line operations and the task handed over to a "regular" infantry unit.