For metals, the thermal conductivity is quite high, and those metals which are the best electrical conductors are also the best thermal conductors.
(the thermal conductivity; is; quite high) (those metals; are; the best electrical conductors) (those metals which are the best electrical conductors; are also; the best thermal conductors)
the thermal conductivity those metals those metals which are the best electrical conductors
is are are also
quite high
the best electrical conductors
the best thermal conductors