Complex sentence: Most roads were cleared within 24 hours, but SH 1 between Seddon and Cheviot via Kaikoura and the Inland Kaikoura Road remained closed, and damage to docks at Wellington also impaired ferry traffic across the Cook Strait.
Split into simpler sentences: Most roads were cleared within 24 hours, but SH 1 between Seddon and Cheviot via Kaikoura and the Inland Kaikoura Road remained closed. Damage to docks at Wellington also impaired ferry traffic across the Cook Strait.