Complex sentence: After they have successfully completed their basic training members of the Corps of Royal Engineers receive their combat engineering and other special-to-arm training at the Royal School of Military Engineering, which is based at several sites in Chatham in Kent, England.
Split into simpler sentences: After they have successfully completed their basic training, members of the Corps of Royal Engineers receive their combat engineering and other special-to-arm training at the RSME. The RSME is based at several sites in Chatham in Kent, England.