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Description
This cladogram is speculative, but it is mostly in line with scientific studies mixed in with my own opinion; no actual phylogenetic analysis was undertaken. Feel free to comment or suggest changes, but be aware that I may reject or modify your suggestions.

Definitions for clade names:

Macronaria - Saltasaurus loricatus <- Diplodocus longus
Camarasauromorpha - Camarasaurus supremus + Saltasaurus loricatus
Camarasauridae - Camarasaurus supremus <- Saltasaurus loricatus
Titanosauriformes - Giraffatitan brancai + Saltasaurus loricatus + Titanosaurus indicus
Brachiosauridae - Brachiosaurus altithorax <- Saltasaurus loricatus
Brachiosaurinae - Brachiosaurus altithorax + Giraffatitan brancai
Somphospondyli - see here

Please note that the above names and/or definitions are not meant to constitute nomenclatural or definitional acts.

Sources for cladogram include but are not limited to:

Mannion et al. (2017). "The earliest known titanosauriform sauropod dinosaur and the evolution of Brachiosauridae"
Pérez-Pueyo et al. (2019). "New contributions to the phylogenetic position of the sauropod Galvesaurus herreroi from the late Kimmeridgian-early Tithonian (Jurassic) of Teruel (Spain)"
Royo-Torres et al. (2019). "A new Brachiosauridae Sauropod dinosaur from the lower Cretaceous of Europe (Soria Province, Spain)"

Description
This cladogram is speculative, but it is mostly in line with scientific studies mixed in with my own opinion; no actual phylogenetic analysis was undertaken. Feel free to comment or suggest changes, but be aware that I may reject or modify your suggestions.

Definitions for clade names:

Macronaria - Saltasaurus loricatus <- Diplodocus longus
Camarasauromorpha - Camarasaurus supremus + Saltasaurus loricatus
Camarasauridae - Camarasaurus supremus <- Saltasaurus loricatus
Titanosauriformes - Giraffatitan brancai + Saltasaurus loricatus + Titanosaurus indicus
Brachiosauridae - Brachiosaurus altithorax <- Saltasaurus loricatus
Brachiosaurinae - Brachiosaurus altithorax + Giraffatitan brancai
Somphospondyli - see here

Please note that the above names and/or definitions are not meant to constitute nomenclatural or definitional acts.

Sources for cladogram include but are not limited to:

Mannion et al. (2017). "The earliest known titanosauriform sauropod dinosaur and the evolution of Brachiosauridae"
Pérez-Pueyo et al. (2019). "New contributions to the phylogenetic position of the sauropod Galvesaurus herreroi from the late Kimmeridgian-early Tithonian (Jurassic) of Teruel (Spain)"
Royo-Torres et al. (2019). "A new Brachiosauridae Sauropod dinosaur from the lower Cretaceous of Europe (Soria Province, Spain)"