Well this is gonna be a guess more than anything else but here we go
So basicly the left side of the "/" is if u are first to act or after limpers,
on the right side u have the guidlines if there is a raise before you.
R/R1 : means that u raise even with limpers and reraise if there is one raiser, and probably just call if there is a raiser and a caller or more.
R0 : means u raise first to act, so if u have a limper in front u just call
R1 : means u raise with 1 limper but call with more
X/C: means u check in bb and if there is a raise before you than you only call
C1,2... : means how many limpers u need to overcall
Thats how i understand it