Amazon has been dabbling in physical retail since 2015, during which time it’s opened a half-dozen bookstores that double as gadget emporia, a score of campus bookstores that don’t sell books and a convenience store without cashiers.
S Amazon
V [has been dabbling] 手を出す
補[in] physical retail 物理的な小売店
補[since] 2015, 2015年より
補[during] which time
どんな
S it
V [has opened]
O a half-dozen bookstores
どんな→that
S
V [double as]
O gadget emporia,
a score [of] campus bookstores 20の本屋
どんな→[that]
S
V [don’t sell] 売らない
O books 本
[and]
a convenience store コンビニ
どんな→[without] cashiers. 持たない レジ