、。
Inside the mall, there's a fairly large multiplex cinema.
Literal
Mall [inside-の中に], relatively large cinema-complex [subject-が] exists.
シネコン is an abbreviation of シネマコンプレックス ('cinema complex, multiplex'). 比較的 ('relatively, comparatively') is a formal adverb — 比較 'comparison' + 的 'adjectival suffix.' モール (from English 'mall') is the standard term for shopping malls. The sentence is simple but demonstrates common loanword abbreviation patterns.