Complex sentence: Andrea transitioned into an extratropical cyclone over South Carolina on June 7, though the remnants continued to move along the East Coast of the United States, until being absorbed by another extratropical system just offshore Maine on June 10.
Split into simpler sentences: Andrea transitioned into an extratropical cyclone over South Carolina on June 7. However, the remnants continued to move along the East Coast of the United State, until being absorbed by another extratropical system just offshore Maine on June 10.