The importance of Otto I, aka known as Otto the Great, in the History of Germany is something beyond question. The importance of Otto I, aka Otto the Great, in the History of Germany is something beyond question.

aka = also known as aka known as = also known as known as

The importance of Otto I, aka known as Otto the Great in the History of Germany, is something beyond question. The importance of Otto I, aka known as Otto the Great in the History of Germany, is something beyond question.

He inherited the Duchy of Saxony and was crowned King of the German upon his father died's death in 936. He inherited the Duchy of Saxony and was crowned King of the German upon his father's death in 936.

When his father died or upon his father's death.

He inherited the Duchy of Saxony and was crowned King of the Germans upon his father diedeath in 936. He inherited the Duchy of Saxony and was crowned King of the Germans upon his father death in 936.

He did a lot more than just retain the inherited reign, h. He pushed forward the integration of the German tribes into a unified kingdom, a process that his father had begun. He did a lot more than just retain the inherited reign. He pushed forward the integration of the German tribes into a unified kingdom, a process that his father had begun.

He did a lot more than just retain the inheriteding his reign, h. He pushed forward the integration of the German tribes into a unified kingdom, a process that his father had begun. He did a lot more than just retain inheriting his reign. He pushed forward the integration of the German tribes into a unified kingdom, a process that his father had begun.

Furthermore, he achieved to bewas crowned Emperor of the Germans in 962, as Charlemagne had done in 800. Furthermore, he was crowned Emperor of the Germans in 962, as Charlemagne had done in 800.

You can't use achieve with a verb like that.

Furthermore he achieved to behe status of crowned Emperor of the Germans in 962, as Charlemagne had done in 800. Furthermore he achieved the status of crowned Emperor of the Germans in 962, as Charlemagne had done in 800.

Born in 912 in the former state of “East Francia”, that i (which is nowadays considered nowadays the first German state) and whose lifespan wasliving for about a century, Otto the Great was the second king of the lineage “Ottonian”"Ottonian" dynasty. Born in 912 in the former state of “East Francia” (which is nowadays considered the first German state) and living for about a century, Otto the Great was the second king of the "Ottonian" dynasty.

Using commas for the "which is ... state" part makes the lifespan part feel out of place and hard to piece together with the rest of the sentence. Also, in context, it should be "with a lifespan of" or "living for," not "whose lifespan was."

Born in 912 in the former state of “East Francia”, that is considered nowadays the first German state and whose lifespan was about a century, Otto the Great was the second king of the lineage “Ottonian” lineage. Born in 912 in the former state of “East Francia”, that is considered nowadays the first German state and whose lifespan was about a century, Otto the Great was the second king of the “Ottonian” lineage.