Splitting (even infinitely splitting, but I really wouldn't recommend it) torpedoes are in FoundationTech, as USS Frontier said, trails can be done (particle emitter, again, as USS Frontier said).
Combining the two is also possible, just provide a new projectile tech that accepts 2 (or more) projectile techs.
Now, model projectiles are something else entirely, it's possible to load a model on projectile fire, but that model won't have any direction associated with it.
Meaning, you would have to, somehow (I haven't figured it out yet), reorient the model with the projectile itself.