Improve the cohesiveness in the following paragraph.
Which complicating the journey, however, was Grierson's Raid. Which rendered unusable portions of the railroad east of Jackson and about 50 miles (80 km) of track south of Brookhaven, Mississippi.
Complicating the journey, however, was Grierson's Raid, which rendered unusable portions of the railroad east of Jackson and about 50 miles (80 km) of track south of Brookhaven, Mississippi.