Complex sentence: The selection of Meteor was not a total loss for Raytheon, as the UK ordered a number of AIM-120s to arm Eurofighter on entry into service which was expected before Meteor development was complete.
Split into simpler sentences: The selection of Meteor was not a total loss for Raytheon. As a consolation prize the UK ordered a number of AIM-120s to arm Eurofighter on entry into service which was expected before Meteor development was complete.