Complex sentence: Daniel Nawskon was a good friend of Uriah and Marco and he agreed to fill in temporarily but ultimatly was convinced to come on full time, however problems began to arise with Bryan and his personal life.
Split into simpler sentences: Daniel Nawskon was a good friend of Uriah and Marco and he agreed to fill in temporarily. Shortly after that Dan agreed to join full time however problems began to arise with Bryan and his personal life.