Complex sentence: His commitment to the FitzAlan earls can only have become more complete with the death of Stafford, another major client, at the Battle of Shrewsbury in 1403, although, it never induced him to give up his work for other clients.
Split into simpler sentences: His commitment to the FitzAlan earls can only have become more complete with the death of Stafford, another major client, at the Battle of Shrewsbury in 1403. However, it never induced him to give up his work for other clients.