Complex sentence: The dull stamps were not popular and the 1884 Stamp Committee was formed to make decisions about improved replacements and in 1887 they were superseded by the Jubilee Issue featuring a variety of designs and colours.
Split into simpler sentences: The dull stamps were not popular, and the 1884 Stamp Committee was formed to make decisions about improved replacements. In 1887 they were superseded by the Jubilee Issue, with a variety of designs and colours.