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There wont be any broken parts. Two of the copper contacts will be dark brown. Clean them and apply a thin coat of VAseline and you should be sorted.Alternatively (like I did) buy the entire switch and only use the bottom piece, keeping the repaired original as a spare.You cannot buy the bottom plastic part on its own.
Doesn’t sound like the case this time, but I have found at least in 50% of the times i couldn’t get the motor to crank it turned out to be less than truly snug battery connections.
Don't use a battery tender on a bike that is regulary used. The modern battery's keep up during winter without tender