Complex sentence: One of his first decisions was to add a keyboard player-a spot eventually filled by the somewhat established musician Vlado Pravdić who had already been contributing to Jutro since the group's beginnings and was on friendly terms with all the members.
Split into simpler sentences: One of his first decisions was to add a keyboard player-a spot eventually filled by the somewhat established musician Vlado Pravdić. He had already been contributing to Jutro since the group's beginnings and was on friendly terms with all the members.