Complex sentence: An amateur group called "Bataviasche Philharmonic Orchestra" was established in Dutch Colonial times, later it turned into the NIROM orchestra, as soon as the radio broadcasting station Nederlandsch-Indische Radio Omroep Maatschappij was born in 1912.
Split into simpler sentences: An amateur group called "Bataviasche Philharmonic Orchestra" was established in Dutch Colonial times. It became the the NIROM orchestra when the radio broadcasting station Nederlandsch-Indische Radio Omroep Maatschappij was born in 1912.