Tadataka Ino was a great man who made an accurate map of Japan in the Edo period, and. I learned about him in my history class at school. Tadataka Ino was a great man who made an accurate map of Japan in the Edo period. I learned about him in my history class at school.

These are two different points so either break it up into two sentences or delete the comma.

Tadataka Ino was a great man who made an accurate map of Japan during the Edo period, and. I learned about him in my history class atwhen I was in school. Tadataka Ino was a great man who made an accurate map of Japan during the Edo period. I learned about him in my history class when I was in school.

In the US, our sentences tend to be shorter than those in Japanese.

At that time, I was not interested in him at all. At that time, I was not interested in him at all.

However I recently I became very interested in him recently.(or I became very interested in learning more about him). However recently I became very interested in him (or I became very interested in learning more about him).

HRecently, however, I amhave become very interested in him recently. Recently, however, I have become very interested in him.

That's because I heard the inside story about his Japanese map production. That's because I heard the inside story about his Japanese map production.

What do you mean by "inside story?"

That's because I hleardned about the inside story aboutof his Jmapanese map productionmaking. That's because I learned about the inside story of his mapmaking.

He thought he could calculate the diameter of the earth, to achieve that purpose, he decided to by makeing a map of Japan. He thought he could calculate the diameter of the earth by making a map of Japan.

He thought he could calculate the diameter of the eEarth and, to achieve thatis purpose, he decided to make a map of Japan. He thought he could calculate the diameter of the Earth and, to achieve this purpose, he decided to make a map of Japan.