This has probably already being discussed at length but as I am new I was curious for the format change!?
<mark>mod edit: moved to Halo 5 Guardians</mark>
Hey. OP - unfortunately splitscreen was something that wasn’t able to return in Halo 5 for technical reasons, but it is something that will be included in future games. This is is a topic that comes up a lot and we have a dedicated megathread available for discussion. Feel free to continue there:
https://www.halowaypoint.com/en-us/forums/6e35355aecdf4fd0acdaee3cc4156fd4/topics/official-split-screen-thread-v4-0/27262665-037d-4b00-b3a8-5c4c4b07e168/posts?page=1