Complex sentence: His trademarks are spiky hair, dungarees and an upturned bucket, which he often uses as a seat-most strips since early 1937 begin and end with a single panel of Wullie sitting on his bucket.
Split into simpler sentences: His trademarks are spiky hair, dungarees and an upturned bucket, which he often uses as a seat. Indeed, most strips since early 1937 begin and end with a single panel of Wullie sitting on his bucket.