Complex sentence: Because of this, France entered the war diplomatically isolated, and it had the support only of its traditional ally, the Electorate of Bavaria (itself knocked out of the war in 1704), and those Spanish loyal to Philip.
Split into simpler sentences: Because of this, France entered the war diplomatically isolated. Having the support only of its traditional ally, the Electorate of Bavaria (itself knocked out of the war in 1704), and those Spanish loyal to Philip.