Complex sentence: "Tequila Sunrise" was written soon after "Desperado" in the same week, in all Frey and Henley were involved in writing of 8 of the 11 songs in the album.
Split into simpler sentences: Tequila Sunrise was written in the same week as "Desperado". In all, Frey and Henley had a hand in writing 8 of the 11 songs in the album.