Because theatrical press agents and publicists, like publishers and printers, are people who rarely see beyond the next deadline, the theatre business has, to an alarming degree, traditionally ignored the preservation of production records.
because 引导的是从句 theatrical press agents and publicists, like publishers and printers, are people who rarely see beyond the next deadline，其中theatrical press agents and publicists是主语，like publishers and printers是主语的插入语，are是谓语，people who rarely see beyond the next deadline是表语。
主句是 the theatre business has, to an alarming degree, traditionally ignored the preservation of production records.其中theatre business（戏剧界、戏剧业）是主语，to an alarming degree是修饰ignored的状语，ignored是谓语，the preservation of production records是宾语。