Complex sentence: The final 43 F-15Cs included the Hughes APG-70 radar developed for the F-15E; these are sometimes referred as "Enhanced Eagles".
Split into simpler sentences: The final 43 F-15Cs included the enhanced-capability Hughes APG-70 radar, which was developed for the F-15E. These 43 F-15Cs with APG-70 radar are sometimes referred as "Enhanced Eagles".