The "from to" command will fill an area with the specified biome type (and randomise different variants if the variant is not specified) and the "at" command will set the specified biome type for the chunk the specified coördinates are in. For people worrying that the /setbiome ~ ~ ~ command that Luca Searle suggests will only
you can set the spawn for every player with: /setworldspawn 130 53 -203. and additionally set the spawn for this "Old player" with. /spawnpoint 530 60 0. Also you can build a clock with a command block doing "spawn point @a 530 60 0" Note: if this "Older Player" sleeps in an bed, his personal spawnpoint will be reset to this bed.
It's not going to affect your spawn, or spawns of those who have already been in your server. To fix your spawn point, after doing /setworldspawn, immediately type /spawnpoint. This will change Your spawn point. It will not change the spawn point of existing players. Their spawn point is saved in the player data files for that world.
Click to expand use /mvm set respawn worldname worldname. so /mvm set respawn worldA. /mvm set respawn worldB. you have to use the command ingame on worldA and worldB. if you do it from the console you must add the world you want the command to affect.
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minecraft set world spawn command