Repeating: scoreboard players test *Ticks Game 0 399
Repeating conditional: scoreboard players enable @a JQ
chain: scoreboard players add @a[score_JQ_min=1] Q 1
chain: scoreboard players set @a[score_Q_min=2] Q 0
chain: scoreboard players set Q Dummy 0
chain: scoreboard players reset * QC
chain: scoreboard players set @a[score_Q_min=1] QC 1
chain: scoreboard players operation Q Dummy += * QC
chain: execute @a[score_JQ_min=1,score_Q_min=1,score_Q=1] ~ ~ ~ say Queue Message
chain: execute @a[score_JQ_min=1,score_Q_min=0,score_Q=0] ~ ~ ~ say Leave Message
chain: scoreboard players set @a JQ 0
chain: scoreboard players test Q Dummy 2
chain conditional: scoreboard players add *Ticks Game 1
chain: scoreboard players test Q Dummy 0 1
chain conditional: scoreboard players test *Ticks Game 1
chain conditional: scoreboard players set *Ticks Game 0
chain conditional: tellraw @a ["",{"text":"Game is restarting!","color":"red"}]

Scoreboard requirements:
JQ - trigger
Q - dummy
QC - dummy
D - dummy
G - dummy