Complex sentence: He then became the newly-established Somaliland polity's first President, but subsequently renounced the separatist platform in 1994 and began instead to publicly seek and advocate reconciliation with the rest of Somalia under a power-sharing federal system of governance.
Split into simpler sentences: He then became the newly-established Somaliland polity's first President, but subsequently renounced the separatist platform in 1994. Tuur concurrently began instead to publicly seek and advocate reconciliation with the rest of Somalia under a power-sharing federal system of governance.