Can a move be broken up?

[existence123]

Can you move half your speed, make an attack, then move the remainder?

[Whale_Cancer]

existence123 wrote:

Can you move half your speed, make an attack, then move the remainder?

No, as several feats exist to specifically enable this kind of action (e.g. Spring Attack).

[Lincoln Hills]

Or, to phrase it differently: Yes, but only if you've trained for it (acquiring the Shot on the Run, Spring Attack, Ride-By Attack or Fly-By Attack feats).