For autosorting from a belt, you can line up some filter funnels on the side with filters for the desired items and make a pretty robust sorting system it that way. The funnels will pick the items off the belt when they move past, kinda like an ice water stream and hoppers in minecraft sorting systems.
The other funnels are like the filter funnel. The splitter divides the items into two lanes (either exactly evenly, or where there is space), and the long distance funnel is just a very long funnel but without a filter.