In good years,the patchwork (ofgreen fields thatsurround the San Joaquin Valley town)bustles with farm workers, many of them in the area just for the season.
'that surround the San Joaquin Valley town' refers to the green fields in particular instead of 'patchwork' grammatically as well as logically. Many green fields surround the town. Moreover, that is an essential modifier which modifies the immediate preceding noun 'green fields'. So, plural surround is applicable. However, these many green fields
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'that surround the San Joaquin Valley town' refers to the green fields in particular instead of 'patchwork' grammatically as well as logically. Many green fields surround the town. Moreover, that is an essential modifier which modifies the immediate preceding noun 'green fields'. So, plural surround is applicable. However, these many green fields
...
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