Complex sentence: SDAR was founded in Johor Bahru on 1 May 1956 which was firstly known as Sekolah Menengah Melayu (Malay Secondary School).
Split into simpler sentences: SDAR was founded in Johor Bahru on 1 May 1956. The school was then named Sekolah Menengah Melayu (Malay Secondary School).