Complex sentence: Around 1200, in the reign of King Sancho I, the golden "morabitino" was introduced, followed a century later, in the reign of King Denis, by the silver "tornês" (worth 50 denarii).
Split into simpler sentences: Around 1200, in the reign of King Sancho I, the golden morabitino is introduced. Around 1300, King Denis introduces a new silver currency, the "tornês" (worth 50 denarii).