In a large skillet, over medium heat, cook sausage until browned, ~3 minutes per side.
Stir in onion and garlic; sauté until softened and fragrant, ~4 minutes.
Stir in the tomatoes, rice and chicken broth; season with salt and pepper; bring to a bubbly boil.
Reduce heat to low; lay chicken on top; cover skillet and simmer until the liquid is absorbed, ~20 minutes.
In a second skillet, over medium-high heat, heat oil until shimmering; season shrimp with salt and pepper, add them to this second skillet; cook and stir, until shrimp are pink and opaque, ~3 minutes.
Using a slotted spoon, transfer the shrimp to the cooked rice skillet.
Wipe out the second skillet; remaining on medium-high heat, pour in wine and lemon juice; add the mussels, cover and cook, shaking the skillet a few times, until the mussels open, ~3 minutes.
Pour the mussels and liquid over the rice; garnish with parsley, cilantro and/or green onions, if desired.