For an algebraically closed field $\mathbb F$ of characteristic zero, a finite-dimensional Lie algebra $\frak G$ has a Cartan subalgebra and these subalgebras are conjugated in a certain sense.
Let $L(\frak G)= \frak G\otimes \mathbb F[t,t^{-1}]$ be the loop algebra associated to $\frak G$ with the natural bracket. Does exist a Cartan subalgebra for $L(\frak G)$? How to describe it?