Complex sentence: It is noteworthy that the issue date coincides with the opening day of the British North America Philatelic Society meeting in Calgary as both the design and purpose of this stamp promise to make it of interest to philatelists and all Canadian citizens alike.
Split into simpler sentences: It is noteworthy that the issue date coincides with the opening day of the British North America Philatelic Society meeting in Calgary. This is signficant because both the design and purpose of this stamp is geared towards the interests of philatelists and all Canadian citizens alike.