Complex sentence: Since the first 1971 issue, the Bangladeshi postal authorities have maintained a conservative issuing policy, with only just over 900 individual stamps and miniature sheets listed in the regular Stanley Gibbons catalogues by 2008, plus approximately 50 issues overprinted "Official" for Governmental use.
Split into simpler sentences: Since the first 1971 issue, the Bangladeshi postal authorities have maintained a conservative issuing policy. Just over 900 individual stamps and miniature sheets were listed in the regular Stanley Gibbons catalogues by 2008, plus approximately 50 issues overprinted "Official" for Governmental use.