Way too many waypoints

When I import a flight plan to RFS, it gives me hundreds of waypoints and the wrong altitude. I can’t be bothered to remove the extra waypoints and change the altitude on the other waypoints. I also don’t want to fly with all the waypoints as they make me ascend and descend like I would walk in a staircase (2000ft up/down, a few seconds of levelled flying and repeat). Can this somehow be changed or are there other apps that simulate realistic flight plans? (Also sorry if I used the wrong tag or whatever it is)

Hi,
What is RFS? Can you upload such a flightplan please? Thank you!

Cheers
Richard