Complex sentence: The discrepancy is resolved by having the signage at the interchange imply I-10 proceeds south from the interchange, rather than west, concurrent with I-5 and I-10 stub is signed as "TO US 101".
Split into simpler sentences: The discrepancy is resolved by having the signage at the interchange imply I-10 proceeds south from the interchange, rather than west, concurrent with I-5. The I-10 stub is signed as "TO US 101".