Complex sentence: The "borgeets" are written in the "pada" form of verse, with the first pada marked as "dhrum", which works as a refrain and repeated a few times over the course of singing of the succeeding verses.
Split into simpler sentences: The "borgeets" are written in the "pada" form of verse. The first pada, marked as "dhrum", works as a refrain and is repeated over the course of singing of the succeeding verses.