Split column by delimiter with a character immediately after it

A fancier way to do this would be to use a character transition splitter. This will keep the commas though, so you'd probably want to trim those off.

 

Full sample query you can paste into the Advanced Editor of a new blank query:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCsnILNYpyExNTtVRyE/TKUmtKNHJS01NKdYpyddJStUpLsjJLFGKjQUA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Text = _t]), 
  #"Split Column by Character Transition" = Table.SplitColumn(
    Source, 
    "Text", 
    Splitter.SplitTextByCharacterTransition({","}, each _ <> " ")
  ), 
  #"Trimmed Text" = Table.TransformColumns(
    #"Split Column by Character Transition", 
    {}, 
    each Text.TrimEnd(_, ",")
  )
in
  #"Trimmed Text"