OK, so the bit that made no sense to me was this:
"A player who receives a second temporary dismissal in the same match will serve the temporary dismissal and then takes no further part in the match"
What's the point of that? They hang around for 10 minutes and then go for an early bath?
It now makes sense because the next bit is this:
"The player may be replaced by a substitute at the end of the second temporary dismissal period"
So, the player can't come back on but the team isn't down to 10 men (assuming there are subs left).
"A player who receives a second temporary dismissal in the same match will serve the temporary dismissal and then takes no further part in the match"
What's the point of that? They hang around for 10 minutes and then go for an early bath?
It now makes sense because the next bit is this:
"The player may be replaced by a substitute at the end of the second temporary dismissal period"
So, the player can't come back on but the team isn't down to 10 men (assuming there are subs left).