Trouble with warden command

Hiya! I’ve been struggling with this and keeps getting stuck up at position 130-155ish, any help or fixes would be great!

summon warden 811 61 491 {CustomName:'[{"text":"The Captive Warden"}]',Health:250,Glowing:1b,PersistenceRequired:1b,Brain:{memories:“{minecraft:dig_cooldown”:{value{},ttl:1200L}}}},HandItems:[{id:diamond,tag:{display:{Name:'[{"text":"Boss Token","italic":false}]',Lore:['[{"text":"Obtained from difficult foes","italic":false}]']},Enchantments:[{}]},Count:1},{id:ender_eye,tag:{display:{Name:'[{"text":"Eye of the Warden","italic":false}]',Lore:['[{"text":"Pried from the Captive Warden","italic":false}]','[{"text":"Can be traded for items","italic":false}]']},Enchantments:[{}]},Count:1}],HandDropChances:[0.5f,0.5f],Attributes:[{Name:"generic.max_health",Base:250f}]}