Complex sentence: The position of the Hyolitha has long been disputed, but has now (2017) been assigned to the Lophophorata, as finely-preserved specimens in the Burgess Shale can be seen to carry lophophores.
Split into simpler sentences: The position of the Hyolitha has long been disputed, but has now (2017) been assigned to the Lophophorata. More recently, they have been assigned to the Lophophorata, as finely-preserved specimens in the Burgess Shale can be seen to carry lophophores.