Complex sentence: After sighting land they turned south, attempting to reach their planned destination at the Colony of Virginia, strong winter seas forced them to return to the harbor at Cape Cod hook, where they anchored on November 11.
Split into simpler sentences: After sighting land they turned south, attempting to reach their planned destination at the Colony of Virginia. However, strong winter seas forced them to return to the harbor at Cape Cod hook, where they anchored on November 11.