Поставьте глаголы в Present Perfect или в Past Simple. Since early 1990s hundreds of homeless people … have crowded the

Since early 1990s hundreds of homeless people have crowded the Metro. Еще с 1990 сотни бездомных людей заполонили метро. ( форма глагола have crowded - The Present Perfect Tense ).  The Latin alphabet was brought to Britain later. Латинский алфавит появился в Британии позже. ( форма глагола- was brought - The Past Simple Tense, passive voice ).