Complex sentence: The first tropical disturbance of the season developed on November 13, to the north-east of Fiji and moved south-eastwards before it weakened into an area of low pressure during November 17, as it affected Fiji.
Split into simpler sentences: The first tropical disturbance of the season developed on November 13 to the north-east of Fiji. It slowly moved towards the southeast, before weakening into an area of low pressure during November 17, as it affected Fiji.