Complex sentence: After the success of "Onno Shomoy", Artcell spent four years carrying out experiments with their music without releasing an album although they did release singles scattered in various albums by other bands or compilation albums.
Split into simpler sentences: After the success of "Onno Shomoy", Artcell spent four years carrying out experiments with their music without releasing an album. They did, however, release singles scattered in various albums by other bands or compilation albums.