Cam sensor(CPS) can't cause a no start
Crank(CKP) sensor can
But it would have no fuel or spark if that was the issue, that's why the no start, without CKP sensor signal computer doesn't know you are trying to start the engine.
'99 could have PATS(passive anti-theft) system.
But again no fuel or spark if that was the problem.
The big 3 for a running engine are:
Spark, at the right time
Fuel, in the right mix with air
Then remove a spark plug, check it's tip for fuel, it should be wet.
Now crank engine again and listen for the distinctive "Whoosh" of the compression stroke.
Or if you have a compression gauge use it, you need above 100psi to start cold engine, 2.5l should be 160+psi with good battery cranking engine fast.
If it is low or you have a lope when cranking engine then timing belt stretched and has skipped, and that is why the no start.
Read here: Help ranger wont start