EDIT:
Never mind, just saw the following in the docs.
If you do not want to combine AND and OR conditions, you can also just list them sequentially, by default all conditions have to be true. The following configuration works the same as the one listed above:
condition:
condition: state
entity_id:
- 'device_tracker.me'
- 'group.us'
state: 'home'
2018-06-06 00:07:00 ERROR (MainThread) [homeassistant.config] Invalid config for [automation]: Entity ID ['device_tracker.me', 'group.us'] is an invalid entity id for dictionary value @ data['condition'][0]['entity_id']. Got None
extra keys not allowed @ data['condition'][0]['state']. Got None
not a valid value for dictionary value @ data['condition'][0]['condition']. Got None. (See /home/homeassistant/.homeassistant/configuration.yaml, line 274). Please check the docs at https://home-assistant.io/components/automation/