You can do a Google shopping search for leather repair kit and get lots of hits. If you're planning on keeping the coach, you will probably be happier with the results if you find an auto upholstery shop to sew in a new panel. Depending on what seats you have, you may also be able to locate new seat covers that you can install yourself.
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Jon & Chris Everton
1986 40' Dog House #86
0 hp 8V92 Allison HT740
Soon to be 500hp ISM with ZF 6 Speed
If you apply regular applications of leather conditioner and cleaner as needed it should prevent the leather from drying up and causing cracks. Look at leather as skin - if it dries out, then comes cracking.