Complex sentence: But the Band would have to wait until 1999 for the next major landmark, as in May of that year, The Epping Forest Pipe Band celebrated their 25th birthday with a Scottish evening, with guests from other local Bands and past members.
Split into simpler sentences: But the Band would have to wait until 1999 for the next major landmark. In May of 1999, The Epping Forest Pipe Band celebrated their 25th birthday with a Scottish evening, with guests from other local Bands and past members.