Complex sentence: Each pair then does a hand clapping "routine" while singing the "bahay kubo" or "Leron-leron Sinta" At the middle of the song, each pair exchanges "routines" with the other.
Split into simpler sentences: Each pair then does a hand clapping "routine" while singing the "Bahay Kubo" or "Leron-leron Sinta". In the middle of the song, each pair would exchange "routines" with the other.