Complex sentence: Note that the UCLA Marching Band currently does not march Baritones or Baritone Saxophones, although marching baritone horns and before that, bell front euphoniums had been a component in the past.
Split into simpler sentences: Note that the UCLA Marching Band currently does not march Baritones or Baritone Saxophones. Although, marching baritone horns, and before that, bell front euphoniums had been a component in the past.