Complex sentence: However, by July 1980, the band was already in the process of breaking up, with Frey refusing to join the band to record overdubs or even speak to his former bandmates, the recording was therefore done piecemeal.
Split into simpler sentences: However, by July 1980, the band was already in the process of breaking up. Frey then refused to join the band to record overdubs or even speak to his former bandmates, the recording was therefore done piecemeal.