Complex sentence: His income subsequently rose to the range of 5000 koku, and an additional 5000 koku granted that year, he entered the ranks of the "fudai daimyo" with the income of 10,000 koku.
Split into simpler sentences: His income subsequently rose to the range of 5000 koku, and an additional 5000 koku was granted that year. He entered the ranks of the "fudai daimyo" with the income of 10,000 koku.