Complex sentence: He declared that after one year of being organized, the Pentecostal Assemblies of the World had its first annual business meeting and that, at the same time, it was Trinitarian in its doctrine and liturgy of water baptism.
Split into simpler sentences: He declared that after one year of being organized, the PAW had its first annual business meeting. At the same time, it was Trinitarian in its doctrine and liturgy of water baptism.