@Peacemaker. This is my reading as well and really the part in brackets is redundant. It's an example of GW not being able to stop "talking" and there by adding confusion. Without the bracket rule is simplified to
1) You can use lance when you charge
2) You can't use lance on a subsequent turn
Which is the same as saying
You can use lance when:
Charge = true AND Subsequent turn = false
As regardless on if it counts as one or two rules you still have to follow both.
Combat after FBIGO leads to Charge = true, Subsequent turn = true meaning lances can't be used.
If lances cannot be used in subsequent player turns, lances are a one use per game item.
There are literally only two possible interpretations using what the rules say, instead of what we wish they said
1) Lances my be used in any player turn where the unit wielding them counts as charging. It doesn't matter if it's a pursuit, an overrun, a new charge, first round, second round, none of that. All that matters is : did you charge.
2) If it is any player turn AFTER you used lances, you may not use lances. Again, it doesn't matter if it's a pursuit, an overrun, a new charge, first round of combat, last round of combat : all that matters is : Is this player turn subsequent to the player turn you charged. If the answer is yes (which it will be for every single player turn of the game now) then no lances
That is because it's not clear how to evaluate the two stage expression 1) You can use lances in a player turn you charged 2) In subsequent player turns, you must use a hand weapon instead.
Is it a logic gate? (IF you charged then lances, otherwise see second clause.) Or does the second part override the first? (Regardless of if you charged or not, if you charged before, no lances )
But anybody bringing phrases like 'rounds of combat' into it is just wrong. The issues with the lances existed prior to the FAQ and the FAQ did not address them in any way. This is due to the ambiguity in the 'subsequent player turns' expression. This would exist even if FBIGO did not exist at all, technically speaking, although without the FBIGO confusion causing everyone to carefully scrutinize every phrase in the rulebook it might not come up.