Complex sentence: In the early stages, Humans lived in relative peace, however, they soon began to realise that Orcs had landed on the Eastern part of the continent and before long tensions were raised as the Humans became protective over their territory.
Split into simpler sentences: In the early stages, Humans lived in relative peace. However, they soon began to realise that Orcs had landed on the Eastern part of the continent and before long tensions were raised as the Humans became protective of their territory.