Complex sentence: During the off-season, Sandoval reportedly signed with the Boston Red Sox, but was later denied by his brother/agent, Michael Sandoval, and his other agent Gustavo Vazquez.
Split into simpler sentences: During the off-season, Sandoval, reportedly, signed with the Boston Red Sox. The signing was later denied by his brother/agent, Michael Sandoval, and his second agent Gustavo Vazquez.